CN106808082B - endless rolling intermediate billet connecting method and system - Google Patents
endless rolling intermediate billet connecting method and system Download PDFInfo
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- CN106808082B CN106808082B CN201710046603.9A CN201710046603A CN106808082B CN 106808082 B CN106808082 B CN 106808082B CN 201710046603 A CN201710046603 A CN 201710046603A CN 106808082 B CN106808082 B CN 106808082B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K20/00—Non-electric welding by applying impact or other pressure, with or without the application of heat, e.g. cladding or plating
- B23K20/12—Non-electric welding by applying impact or other pressure, with or without the application of heat, e.g. cladding or plating the heat being generated by friction; Friction welding
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B1/00—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations
- B21B1/22—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling plates, strips, bands or sheets of indefinite length
- B21B1/24—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling plates, strips, bands or sheets of indefinite length in a continuous or semi-continuous process
- B21B1/26—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling plates, strips, bands or sheets of indefinite length in a continuous or semi-continuous process by hot-rolling, e.g. Steckel hot mill
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B15/00—Arrangements for performing additional metal-working operations specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
- B21B15/0085—Joining ends of material to continuous strip, bar or sheet
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K20/00—Non-electric welding by applying impact or other pressure, with or without the application of heat, e.g. cladding or plating
- B23K20/12—Non-electric welding by applying impact or other pressure, with or without the application of heat, e.g. cladding or plating the heat being generated by friction; Friction welding
- B23K20/122—Non-electric welding by applying impact or other pressure, with or without the application of heat, e.g. cladding or plating the heat being generated by friction; Friction welding using a non-consumable tool, e.g. friction stir welding
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K20/00—Non-electric welding by applying impact or other pressure, with or without the application of heat, e.g. cladding or plating
- B23K20/12—Non-electric welding by applying impact or other pressure, with or without the application of heat, e.g. cladding or plating the heat being generated by friction; Friction welding
- B23K20/122—Non-electric welding by applying impact or other pressure, with or without the application of heat, e.g. cladding or plating the heat being generated by friction; Friction welding using a non-consumable tool, e.g. friction stir welding
- B23K20/1245—Non-electric welding by applying impact or other pressure, with or without the application of heat, e.g. cladding or plating the heat being generated by friction; Friction welding using a non-consumable tool, e.g. friction stir welding characterised by the apparatus
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Metal Rolling (AREA)
- Pressure Welding/Diffusion-Bonding (AREA)
Abstract
The invention provides a method for connecting headless rolling intermediate billets, which is characterized in that the head and tail ends of front and rear intermediate billets are aligned, the tail end surface of the front intermediate billet and the head end surface of the rear intermediate billet are rubbed, forward force is applied to the rear intermediate billet during the rubbing, and after the temperature of the connecting end surface of the front intermediate billet and the rear intermediate billet is raised to reach a viscoplasticity state, the head of the rear intermediate billet is connected with the tail of the front intermediate billet forward under the action of upsetting force. The invention has high connection strength, high connection speed and low energy consumption, and is suitable for connection of slabs made of different materials.
Description
Technical Field
The invention belongs to the field of hot rolling equipment, and relates to a method and a system for connecting intermediate billets in the process of changing conventional hot rolling into endless rolling in the steel industry.
Background
The traditional hot continuous rolling finishing mill group for the plate strip rolls a single intermediate billet, and the plate strip enters the finishing mill group to generally undergo the processes of threading, accelerated rolling, decelerated rolling, steel throwing, tail flicking and the like. In the finish rolling process, particularly in the thin rolling process, the biting of the head part of the plate strip between the finish rolling mill frames is easily blocked, steel piling, slipping and tail-flick folding of the tail part are formed, and the tail-flick forms folding biting, so that the surface damage of a roller and the like are generated; during coiling, steel pile and the like are formed due to coiling difficulty caused by snaking, bending and the like of the front end of the plate strip; single billet rolling is carried out, load prediction and roll gap value setting are carried out on each rolled billet, and if the rolling force prediction is not accurate, the thickness and convexity change of the strip steel and the shape fluctuation between the frames can be caused by the rolling force prediction error; in the thin gauge rolling, because the heat dissipation of the strip steel is fast, in order to ensure the rolling temperature of the thin strip steel, the threading speed and the stable rolling speed need to be improved as much as possible, but after the threading speed is improved, various threading problems and the failure rate caused by head folding and the like are increased, so the traditional hot rolling production of the thin gauge is limited to a certain extent; in addition, the time interval between finishing mill coils also affects the performance of mill capacity.
The endless rolling of the hot-rolled strip steel means that the rolled blank is not divided into blocks in the finish rolling stage, the strip is threaded once, the continuous finish rolling is carried out, and the rolled strip steel is coiled according to the required weight by a high-speed flying shear. Endless rolling overcomes the limitations of intermittent rolling while solving the aforementioned intermittent rolling problems: the problem of threading is solved by rolling without heads and tails; the quality stability and the yield are improved through stable rolling; the production efficiency is improved by reducing the tape threading times and ensuring that the coiling clearance time is almost zero; it is possible to produce ultra-thin strip steel or wide sheet steel exceeding the past limit rolling size, and to roll new varieties by lubrication rolling and forced cooling. The endless rolling technology improves the yield, the dimensional and shape precision and the thin and ultrathin specification proportion of the plate strip, realizes that part of the plate strip is cooled by heat, reduces the consumption of the roller and obtains remarkable effect. The technology is a leap of steel production technology, and represents the leading-edge technology of hot-rolled strip steel in the world.
Among the endless rolling techniques, the technique for connecting intermediate billets after rough rolling is one of the key techniques for realizing endless rolling. Because the finishing mill group adopts tension rolling, the connection quality of the intermediate billet in a hot state influences whether endless rolling can be realized, if the connection time is too long, the production efficiency is influenced, obvious temperature drop is generated, the subsequent finish rolling is difficult to carry out, and if the connection strength is not high and the quality is not good, strip breakage is easy to occur at the joint, so that the continuous finish rolling cannot be carried out; and the connecting equipment is not suitable to be complicated, otherwise, the installation position of the equipment is limited, and the investment, production and maintenance cost is increased.
At present, the endless rolling intermediate billet connection method mainly includes a lap-rolling press-connection method, a butt-joint press-connection method, a welding method, a mechanical connection method, a reduction flame treatment connection method, a direct-current connection method, an induction heating connection method, a laser welding method, and the like. Among these joining methods, induction heating joining, laser heating joining, and shear friction joining are industrially used.
The induction heating connection method is a connection technology adopted by Kawasaki iron making, a tiny gap is kept between the tail end of a front plate blank and the front end of a rear plate blank, and an alternating magnetic field is applied to the thickness direction of the plate blanks in the state, so that induced current can be generated on the joint end surface of the two plate blanks. The end face of the plate blank generates heat and rises temperature due to joule heat caused by the induction current, and then the joint face is pressed and connected. In this connection method, since the current flowing through the corner portions of the strip ends is much smaller than the current flowing through the middle portion during induction heating, the unbonded portions remain at the end portions of the connection surface. Meanwhile, the temperature of the connecting area is higher than that of other parts of the strip blank, and the strength of the connecting area is lower than that of other areas, so that the connecting area becomes a weak link in the endless rolling process, and strip breakage is easily caused.
The laser heat welding method is a connecting technology adopted by the new iron, and compared with an induction heating connecting method, the laser heat welding method can eliminate the existence of the un-combined part of the connecting end surface, but still has the problems that the temperature of the combined part is higher than that of other parts, and the applicable steel grade is limited; and the power required by the laser is very large, thus obviously increasing the equipment investment and the production cost.
The shearing friction connection method is that a shearing machine with special design is adopted to cut off the lapping area of the intermediate billet along the inclined plane, two non-oxidation surfaces are formed by shearing, the newly formed two surfaces generate relative motion by the shearing force, friction is generated, a large amount of heat energy is generated, the diffusion of the surfaces is accelerated, and the shearing machine applies pressure to the inclined plane to form physical combination along the shearing plane while shearing. The connection method is mainly suitable for connection of the same material due to the fact that pressure is applied to the shearing surface to carry out physical connection, and when different materials are connected, the strength of a connection area is affected due to different chemical components and physical metallurgical characteristics.
In a word, the intermediate billet connection modes in the prior art all have one or more of the problems of large equipment investment, low intermediate billet connection strength, slow connection speed, unsuitability for connection of dissimilar steel materials, huge equipment and high maintenance cost.
Disclosure of Invention
In view of the above-mentioned disadvantages of the prior art, the present invention aims to provide a method for joining an endless rolled intermediate slab of a hot rolled plate strip, which has a simple structure, high joining strength, and a high joining speed.
in order to achieve the above objects and other related objects, the technical solution of the present invention is as follows:
A method for connecting the front and back intermediate blanks without head rolling includes such steps as aligning the ends of front and back intermediate blanks, rubbing the end surface of tail part of front intermediate blank with the end surface of head part of back intermediate blank, applying forward upsetting force to back intermediate blank during rubbing, and connecting the head of back intermediate blank with the tail part of front intermediate blank under the action of upsetting force.
Before the front and rear intermediate blanks are connected, the head and the tail of the intermediate blanks after rough rolling are cut to be flush by a shearing machine, so that the intermediate blanks form straight head and tail end surfaces.
After the front and rear intermediate blanks are connected, the burrs extruded from the connecting area of the intermediate blanks are removed through a burr machine, and the removed burrs and burrs are blown off through a burr blowing device.
The middle blank connecting device comprises an outlet clamping device for clamping a front middle blank, an inlet clamping device for clamping a rear middle blank, a friction mechanism for rubbing the connecting end surfaces of the front middle blank and the rear middle blank, a driving mechanism for driving the friction mechanism to move and an upsetting device for applying upsetting force, wherein the friction mechanism is positioned between the inlet clamping device and the outlet clamping device, the upsetting device is positioned in front of the inlet clamping device, and the upsetting device applies upsetting force to the rear middle blank through the inlet clamping device.
The method comprises the steps of clamping a front intermediate blank and a rear intermediate blank by using an outlet clamping device and an inlet clamping device, then rubbing the connecting end surfaces of the front intermediate blank and the rear intermediate blank by using a rubbing mechanism, applying forward force to the rear intermediate blank by using an upsetting device during rubbing to increase the rubbing pressure, removing the rubbing mechanism when the end surface of the intermediate blank and the nearby area are rapidly heated to reach a viscoplasticity state, butting the head end surface of the rear intermediate blank with the tail end surface of the front intermediate blank forward under the action of the upsetting device, continuously applying upsetting force, and connecting the front intermediate blank and the rear intermediate blank together.
The friction mechanism is a friction disc, the friction disc is mounted on the friction disc transverse moving tool rest, the friction disc transverse moving tool rest is mounted in the friction disc pressing tool rest, and the driving mechanism comprises a power mechanism for driving the friction disc to rotate and a pushing mechanism for driving the friction disc transverse moving tool rest to transversely reciprocate and driving the friction disc pressing tool rest to vertically move.
The friction disc moves in a reciprocating manner along the width direction of the middle blank during the transverse movement, and the transverse movement distance ensures that the friction disc is contacted with the cross section of the whole middle blank; and when the friction disc moves downwards, the friction disc goes deep below the lower surface of the intermediate blank.
The friction disk is one or more, and when the friction disk is a plurality of, the friction disks are arranged in a line at equal intervals along the width direction of the middle blank. A
The friction mechanism is a friction blade, and further comprises a friction blade pressing tool rest, a friction blade vibrating tool rest and a friction blade vibrating device, the friction blade is installed on the friction blade vibrating tool rest, the friction blade vibrating tool rest is installed in the friction blade pressing tool rest, and the friction blade vibrating device is directly or indirectly connected with the friction blade to enable the friction blade to vibrate.
The friction blade vibration device is positioned above or on the side surface of the middle blank, and when the friction blade vibration device is arranged above the middle blank, the friction blade is vertical to the surface of the middle blank to vibrate up and down; when the friction blade vibration device is arranged on the side surface of the middle blank, the friction blade vibrates along the width direction of the middle blank; the friction blade penetrates below the lower surface of the intermediate blank when downwards moving under the driving of the friction blade pressing down the tool rest, and the vibration frequency range of the friction blade vibration device is 10Hz-300 Hz; the amplitude is less than or equal to 10 mm.
The invention also provides a connecting system of the headless rolled intermediate billets, and the connecting system comprises a hot coil box, a pinch roll, a shearing machine, an intermediate billet connecting device, a deburring machine and a burr sweeping device which are sequentially arranged between the roughing mill and the first frame finishing mill of the hot continuous rolling production line.
The working principle of the system is as follows: firstly, cutting and leveling the head and the tail of a roughly rolled intermediate billet by using a shearing machine to enable the intermediate billet to form straight head and tail end surfaces; then the head and tail end parts of the front and rear two intermediate blanks are butted; and then, the end surface of the tail part of the front intermediate billet and the end surface of the head part of the rear intermediate billet are rubbed by using an intermediate billet connecting device, during the rubbing, the upsetting device applies friction pressure to the rear intermediate billet to rapidly heat the end surface of the intermediate billet and the nearby area to reach a viscoplasticity state, at the moment, the friction mechanism is rapidly lifted, the end surface of the head part of the rear intermediate billet is rapidly butted with the end surface of the tail part of the front intermediate billet forwards under the action of the upsetting device and a pinch roll, and the upsetting force is continuously applied, so that the front intermediate billet and the rear intermediate billet can be connected together. And removing the flash extruded from the connecting area of the intermediate blank by a deburring machine, and blowing off the removed flash by a flash blowing device. The intermediate billet is uncoiled by a hot coiling box and then is clamped by a pinch roll and driven to advance; when the head and the tail of the intermediate blank are detected by the shearing machine, the head and the tail of the intermediate blank are cut, and the head and the tail of the intermediate blank are leveled; when the intermediate billet connecting device staying at the initial position detects the strip tail of the front block intermediate billet, the intermediate billet connecting device is started and accelerated immediately, and once the front block intermediate billet is overtaken and the tail part of the front block intermediate billet is positioned on the intermediate billet connecting device and clamped by the outlet clamping device, the intermediate billet connecting device and the intermediate billet run synchronously; when the strip head of the rear block intermediate billet overtakes the front block intermediate billet under the driving of the pinch roll, the inlet clamping device clamps the rear block intermediate billet; starting a friction blade vibration device, pressing down a tool rest by a friction blade gradually to rub the connecting end surfaces of front and rear intermediate blanks, applying friction pressure to the rear intermediate blank by an upsetting device during the rubbing process to rapidly heat the end surface of the intermediate blank and the adjacent area to reach a viscoplasticity state, rapidly lifting up the friction blade at the moment, rapidly butting the head end surface of the rear intermediate blank with the tail end surface of the front intermediate blank forwards under the action of the upsetting device, continuously applying upsetting force to connect the front and rear intermediate blanks together; then, the upper and lower clamping blocks of the inlet and outlet clamping devices are loosened, and meanwhile, the intermediate billet connecting device decelerates and then rapidly returns to the initial position, so that an intermediate billet connecting cycle is completed, and the next round of connection is carried out; when the well-connected intermediate blank passes through the deburring machine, the flashes on the upper surface and the lower surface of the joint are removed, and when the well-connected intermediate blank passes through the flash blowing device, the flashes and burrs are thoroughly blown off so as to prepare for entering the finishing mill.
The invention has the following beneficial effects:
1. The equipment is simple:
Only a set of pinch roll, a set of shearing machine, a set of intermediate billet connecting device, a set of deburring machine and a set of burr purging device are needed to be arranged between a hot coil box behind a roughing mill of a conventional hot continuous rolling production line and a first frame finishing mill. Since the oxide film on the end face is crushed and extruded at the time of upsetting, special treatment such as descaling is not required.
2. The connection speed is high:
The self temperature of the intermediate blank reaches 950-1100 ℃, so that the viscoplasticity state suitable for welding can be achieved only by short-time friction.
3. Joint strength is high, is applicable to the slab connection of different materials:
Friction welding is adopted, the welded material is not melted, the metal in a welding area is a forging structure, and the defect of melting welding is avoided; under the action of the top forging pressure, a welding area generates some mechanical metallurgical effects, and the friction surface generates a self-cleaning effect without an oxide layer; the friction welding time is short, the heat affected zone is narrow, and the structure of the heat affected zone is not obviously coarsened; the friction is needed, the requirement on the shearing quality of the end face of the intermediate billet can be reduced, and the upsetting pressure can crush and extrude the oxidized metal and other harmful impurities on the connecting end face, so that the step of removing the oxidized layer on the connecting end face of the intermediate billet before connection can be omitted, the process and the equipment are simplified, the joint metal is forged under the action of pressure, the grain refinement is promoted, and the mechanical property of the joint is improved. The characteristics are favorable for obtaining the welding joint with the strength equal to that of the base metal, and simultaneously, the wide technological adaptability of the device is determined, and the device is suitable for the connection of plate blanks made of different materials.
Drawings
FIG. 1 is a schematic structural view of a endless rolling intermediate billet joining system according to the present invention;
Fig. 2 is a schematic structural view of an intermediate blank connection device according to embodiment 1 of the present invention;
FIG. 3 is a schematic view showing the structure of a friction disk, a pressing blade holder and a traverse blade holder in example 1;
FIG. 4 is a schematic view showing the up-and-down movement of the friction disk with the pressing tool holder in embodiment 1;
FIG. 5 is a schematic diagram showing the leftward and rightward transverse movement of the friction disk with the transverse tool holder in embodiment 1;
Fig. 6 is a schematic structural view of an intermediate blank connecting device according to embodiment 2 of the present invention;
FIG. 7 is a schematic structural view of a friction blade, a friction blade oscillating tool holder and a friction blade pressing tool holder in example 2;
FIG. 8 is a schematic view showing the up-and-down movement of the friction blade with the depressing tool post in embodiment 2;
Fig. 9 is a schematic view showing the left-right and up-down vibration of the friction blade vibrating tool rest according to the friction blade in example 2.
Part number description:
1 Friction mechanism
2 friction disk transverse moving tool rest
3 friction disk pressing knife rest
4 friction disk driving device
41 telescopic universal shaft
5 Inlet clamping device
6 export clamping device
7 upsetting device
8 intermediate blank
81 rear block intermediate blank
82 front block intermediate blank
91 friction blade vibration knife rest
92 friction blade pressing tool rest
93 friction blade vibration device
100 roughing mill
200 hot coiling box
300 pinch roll
400 shearing machine
500 intermediate billet connecting device
600 deburring machine
700 burr purging device
800 first frame finishing block
Detailed Description
The following description of the embodiments of the present invention is provided for illustrative purposes, and other advantages and effects of the present invention will become apparent to those skilled in the art from the present disclosure.
Example 1
in this example, the front-rear direction is the rolling direction as the front.
The invention provides an intermediate billet connecting method, which is characterized in that the head and tail end parts of front and rear intermediate billets are aligned, the tail end surface of the front intermediate billet and the head end surface of the rear intermediate billet are rubbed, forward friction pressure is applied to the rear intermediate billet during the rubbing, the connecting end surfaces and the nearby areas of the front and rear intermediate billets are rapidly heated to reach a viscoplasticity state, and the head part of the rear intermediate billet is forwards connected with the tail part of the front intermediate billet under the action of upsetting force. The friction mode can adopt rotary friction or vibration friction.
By adopting a solid welding method, the welded material is not melted, and the metal in a welding area is a forging structure without the defect of melting welding; under the action of the upsetting force, a welding area generates some mechanical metallurgical effects, and the friction surface generates a self-cleaning effect without an oxidation layer; the friction welding time is short, the heat affected zone is narrow, and the structure of the heat affected zone is not obviously coarsened. The friction is needed, the requirement on the shearing quality of the end face of the intermediate billet can be reduced, and the upsetting pressure can crush and extrude the oxidized metal and other harmful impurities on the connecting end face, so that the step of removing the oxidized layer on the connecting end face of the intermediate billet before connection can be omitted, the process and the equipment are simplified, the joint metal is forged under the action of pressure, the grain refinement is promoted, and the mechanical property of the joint is improved. The method is favorable for obtaining the welding joint with the same strength as the base metal, and is also suitable for the connection of plate blanks made of different materials.
The invention also provides a connecting system of the headless rolled intermediate billets, which is used for realizing the connecting method of the intermediate billets, and comprises an intermediate billet connecting device 500, a hot rolling box 200, a pinch roll 300, a shearing machine 400, a deburring machine 600 and a burr purging device 700, wherein the hot rolling box 200, the pinch roll 300, the shearing machine 400, the intermediate billet connecting device 500, the deburring machine 600 and the burr purging device 700 are sequentially arranged between the roughing mill 100 and the first frame finishing mill 800 of the hot continuous rolling production line. As shown in fig. 1.
The intermediate billet connecting device 500 is used for connecting the front intermediate billet 82 and the rear intermediate billet 81, and as shown in fig. 1, the intermediate billet connecting device 500 comprises an inlet clamping device 5, an outlet clamping device 6, a friction mechanism 1 and an upsetting device 7, wherein the inlet clamping device 5 is used for clamping the rear intermediate billet 81, the outlet clamping device 6 is used for clamping the front intermediate billet 82, the friction mechanism 1 is a friction disc which is positioned between the inlet clamping device 5 and the outlet clamping device 6 and is used for rubbing the connecting end surfaces of the front intermediate billet 82 and the rear intermediate billet 81, the upsetting device 7 is positioned in front of the inlet clamping device 5, and the upsetting device 7 applies an upsetting force to the rear intermediate billet 81 through the inlet clamping device 5. A drive mechanism is also included, which directly or indirectly drives the friction disks to rotate and move. One or more friction disks are arranged in a row at equal intervals along the width direction of the middle blank when the number of the friction disks is multiple.
Specifically, the driving mechanism comprises a power mechanism driving the friction disc to rotate and a pushing mechanism driving the friction disc to move transversely, vertically and transversely and vertically. The power mechanism adopts a motor, the motor is arranged on a motor support and is connected with the friction mechanism 1 through a telescopic universal joint shaft 41, the motor support can be arranged on a main body frame of the intermediate billet connecting device, and the motor, the motor support and the telescopic universal joint shaft 41 move together with the intermediate billet connecting device 500. The pushing mechanism drives the friction disc to move the tool holder 2 transversely and the friction disc presses the tool holder 3 downwards, and the pushing mechanism can be driven by air pressure, hydraulic pressure or a motor.
In this example, the friction disk is mounted on a friction disk traverse blade holder 2, and the friction disk traverse blade holder 2 is mounted in a friction disk press blade holder 3. The friction disc is driven by the friction disc transverse moving tool rest 2 to rapidly reciprocate along the width direction of the middle blank 8, and the reciprocating distance is ensured to be contacted with the cross section of the whole middle blank 8; the friction disk and the friction disk transverse moving tool rest 2 are pressed down by the friction disk pressing tool rest 3, and the friction disk is deep below the lower surface of the middle blank 8; the end surfaces of the intermediate blank 8 in the width and thickness directions are ensured to be rubbed. In case a single friction disc can cover the width of the intermediate blank, the friction disc may also be omitted from traversing the tool holder 2 without performing a lateral movement.
Further, in order to ensure the stability of clamping; the inlet and outlet holding devices 5, 6 are each provided with an upper and a lower holding block, the length of which is greater than the width of the intermediate blank. Furthermore, the inlet clamp 5 can be omitted if the upsetting means 7 has a clamping function. The upsetting device 7 mainly applies force to the rear block intermediate billet 81 to enable the rear block intermediate billet 81 to be capable of rapidly and continuously compressing the front block intermediate billet 82, and the upsetting force can be further amplified through a lever by adopting motor driving or hydraulic driving. The inlet clamping device 5 and the outlet clamping device 6 are hydraulically driven and comprise an upper clamping block and a lower clamping block which mainly have a clamping and supporting effect on the intermediate blank.
The upsetting means 7, the inlet holding means 5 and the outlet holding means 6 are well known in the art and will not be described in detail here.
in order to ensure that the friction disk contacts the whole cross section of the intermediate blank when the friction disk moves the tool holder 2 in a reciprocating manner, as shown in fig. 3 to 5, the friction disk moves by a distance S1, the maximum distance S2 is formed on the intermediate blank 8 when the friction disk is pressed, and the distance S3 is formed from the edge of the intermediate blank 8 when the friction disk is pressed, the following relations are ensured: s1> S2> S3.
The connection method based on the system comprises the following steps: the intermediate billet is uncoiled by the hot coiling box 200 and then is clamped and driven to advance by the pinch roll 300; when the shearing machine 400 detects the head and the tail of the intermediate billet 8, the head and the tail of the intermediate billet 8 are cut, so that the head and the tail of the intermediate billet 8 are flush; when the intermediate blank connecting device 500 staying at the initial position detects the belt tail of the front intermediate blank 82, the intermediate blank connecting device 500 is immediately started and accelerated, and once the front intermediate blank 82 is caught up and the tail part thereof is put in place on the intermediate blank connecting device 500, the outlet clamping device 6 clamps it, and the intermediate blank connecting device 500 operates in synchronization with the intermediate blank; when the strip head of the rear intermediate billet 82 overtakes the front intermediate billet 82 under the drive of the pinch roll 300, the inlet clamping device 5 clamps the rear intermediate billet 82; the friction disc transmission device 4 is started, the rotating friction disc is gradually pressed down to rub the connecting end surfaces of the front and rear intermediate blanks, the upsetting device 7 applies friction pressure to the rear intermediate blank 81 during the rubbing process to rapidly heat the end surface of the intermediate blank and the adjacent area to reach a viscoplasticity state, the friction disc is rapidly lifted at the moment, the end surface of the head of the rear intermediate blank 81 is rapidly butted with the end surface of the tail of the front intermediate blank 82 forwards under the action of the upsetting device 7 and the pinch roll 300, and upsetting force is continuously applied to connect the front and rear intermediate blanks together; next, the upper and lower clamping blocks of the inlet and outlet clamping devices are released, and at the same time, the intermediate billet connecting device 500 decelerates and then rapidly returns to its initial position, completing an intermediate billet connecting cycle, and entering the next round of connection; when the connected intermediate billet 8 passes through the deburring machine 600, the burrs on the upper and lower surfaces of the joint are removed, and when the connected intermediate billet passes through the burr blowing device 700, the burrs and burrs are thoroughly blown off to prepare for entering the finishing mill 800.
Example 2
The difference between this example and example 1 is that the structure of the intermediate billet connecting device 500 is different, as shown in fig. 6 and fig. 7, this example adopts a mode of vibration friction, that is, the friction mechanism 1 is a friction blade, and further includes a friction blade vibration tool rest 91, a friction blade pressing tool rest 92, a friction blade vibration device 93, an inlet clamping device 5, an outlet clamping device 6 and an upsetting device 7. The inlet holding device 5, the outlet holding device 6 and the upsetting device 7 are the same as in embodiment 1.
The inlet clamping device 5 is used for clamping the rear block intermediate blank 81, the outlet clamping device 6 is used for clamping the front block intermediate blank 82, the friction blade is arranged on the friction blade vibration tool rest 91, and the friction blade vibration tool rest 91 is arranged in the friction blade pressing tool rest 92; the friction blade is positioned between the inlet holding device 5 and the outlet holding device 6, and the friction blade is vibrated by the friction blade vibrating device 93 to rub the connecting end surfaces of the front intermediate billet 82 and the rear intermediate billet 81, the upsetting device 7 is positioned in front of the inlet holding device 5, and the upsetting device 7 applies an upsetting force to the rear intermediate billet 81 by the inlet holding device 5.
As shown in fig. 8 and 9, in order to ensure that the friction blade is in sufficient contact with the connecting end surfaces of the front intermediate blank 82 and the rear intermediate blank 81, the length direction of the friction blade is consistent with the width direction of the intermediate blank 8, and the length of the friction blade is greater than the maximum width of the intermediate blank 8; the friction blade is pressed down by the friction blade pressing tool rest 92, the pressing depth range H is ensured, and the friction blade can penetrate into the lower surface of the intermediate blank 8. The raising and lowering movement of the friction blade depressing tool post 92 may be driven by pneumatic, hydraulic, or electric motors, etc. The friction blade vibration device 93 can adopt various forms, such as a motor driving form, hydraulic vibration or electromagnetic vibration and the like, and meets the requirements of controllable amplitude and frequency.
The friction blade is driven by the friction blade vibration device 93 to vibrate rapidly and reciprocally, the vibration direction is vertical or horizontal, and the vibration frequency range is as follows: 10Hz-300 Hz; the amplitude S is generally 10mm or less, preferably 3mm to 5 mm. The amplitude cannot be too large, and the amplitude is too large, so that the friction pair is easy to destabilize, and the weldment is difficult to center and fails to weld.
The upsetting device 7 is positioned in front of the inlet clamping device 5, and applies upsetting pressure to the rear block intermediate billet 81 through the inlet clamping device 5, wherein the pressure range is 10MPa-200MPa, the upsetting pressure is not too high, otherwise, a large amount of bonding media are extruded, and the welding effect is reduced.
Further, the friction blade may vibrate in a direction perpendicular to the intermediate slab 8 or in a width direction of the intermediate slab 8, the friction blade vibration device 93 is installed above or at a side of the intermediate slab, and when the friction blade vibration device 93 is installed above the intermediate slab, the friction blade vibrates up and down perpendicular to the surface of the intermediate slab 8; the friction blade vibrating device 93 is installed at the side surface of the intermediate blank, and the friction blade vibrates in the width direction of the intermediate blank 8, and specifically, the friction blade vibrating device 4 may be installed on the frame of the connecting apparatus itself, or a frame support may be additionally provided outside the connecting apparatus.
In summary, the present invention has a simple structure, and the oxide film on the end face is crushed and extruded during the upsetting, so that special treatments such as descaling are not required.
The connection speed is high: the self temperature of the intermediate blank reaches 950-1100 ℃, so that the viscoplasticity state suitable for welding can be achieved only by short-time friction.
Joint strength is high, is applicable to the slab connection of different materials: by adopting a friction welding method, the welded material is not melted, and the metal in a welding area is a forging structure without the defect of melting welding; under the action of the top forging pressure, a welding area generates some mechanical metallurgical effects, and the friction surface generates a self-cleaning effect without an oxide layer; the friction welding time is short, the heat affected zone is narrow, and the structure of the heat affected zone is not obviously coarsened. The method and the system have wide process adaptability and are suitable for connecting plate blanks made of different materials.
Any person skilled in the art can modify or change the above-mentioned embodiments without departing from the spirit and scope of the present invention. Accordingly, it is intended that all equivalent modifications or changes which can be made by those skilled in the art without departing from the spirit and technical spirit of the present invention be covered by the claims of the present invention.
Claims (6)
1. A connecting method of endless rolling intermediate billets is characterized in that: aligning the head and tail end parts of the front and rear intermediate blanks, rubbing the tail end surface of the front intermediate blank and the head end surface of the rear intermediate blank, applying forward upsetting force to the rear intermediate blank during rubbing, heating the connecting end surface of the front and rear intermediate blanks to a viscoplastic state, connecting the head of the rear intermediate blank with the tail of the front intermediate blank under the action of upsetting force, connecting the front and rear intermediate blanks by using an intermediate blank connecting device, wherein the intermediate blank connecting device comprises an outlet clamping device, an inlet clamping device, a rubbing mechanism, a driving mechanism for driving the rubbing mechanism to move and an upsetting device, clamping the front intermediate blank and the rear intermediate blank by using the outlet clamping device and the inlet clamping device, rubbing the connecting end surfaces of the front intermediate blank and the rear intermediate blank by using the rubbing mechanism, applying forward force to the rear intermediate blank by using the upsetting device during rubbing, when the end face of the intermediate blank and the adjacent area rapidly rise to reach a viscoplasticity state, the friction mechanism is removed, the end face of the head of the rear intermediate blank is forwards butted with the end face of the tail of the front intermediate blank under the action of the upsetting device, and upsetting force is continuously applied to connect the front intermediate blank and the rear intermediate blank together;
The friction mechanism is a friction disc, the friction disc is mounted on the friction disc transverse moving tool rest, the friction disc transverse moving tool rest is mounted in the friction disc pressing tool rest, and the driving mechanism comprises a power mechanism for driving the friction disc to rotate and a pushing mechanism for driving the friction disc transverse moving tool rest to transversely reciprocate and driving the friction disc pressing tool rest to vertically move.
2. A joining method of endless rolled intermediate billets as claimed in claim 1, characterised in that: before the front and rear intermediate blanks are connected, the head and the tail of the intermediate blanks after rough rolling are cut to be flush by a shearing machine, so that the intermediate blanks form straight head and tail end surfaces.
3. a method of joining endless rolled intermediate billets as claimed in claim 1 or 2, characterised in that: after the front and rear intermediate blanks are connected, the burrs extruded from the connecting area of the intermediate blanks are removed through a burr machine, and the removed burrs and burrs are blown off through a burr blowing device.
4. A joining method of endless rolled intermediate billets as claimed in claim 1, characterised in that: the friction disc moves in a reciprocating manner along the width direction of the middle blank during the transverse movement, and the transverse movement distance ensures that the friction disc is contacted with the cross section of the whole middle blank; and when the friction disc moves downwards, the friction disc goes deep below the lower surface of the intermediate blank.
5. A method of joining endless rolled intermediate billets as claimed in claim 1 or 4, characterised in that: the friction disk is one or more, and when the friction disk is a plurality of, the friction disks are arranged in a line at equal intervals along the width direction of the middle blank.
6. A connecting system of endless rolled intermediate billets, which employs a connecting method of endless rolled intermediate billets as claimed in any one of claims 1 to 5, characterized in that: the system comprises a hot coil box, a pinch roll, a shearing machine, an intermediate billet connecting device, a deburring machine and a burr purging device which are sequentially arranged between a roughing mill and a first frame finishing mill of a hot continuous rolling production line.
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| CN108453132B (en) * | 2017-12-28 | 2020-10-02 | 上海二十冶建设有限公司 | Modularized installation method for ultrathin strip production line hot box |
| CN108405618A (en) * | 2018-05-11 | 2018-08-17 | 中冶赛迪工程技术股份有限公司 | A kind of long material endless rolling connection method and its rolling line |
| CN111389921B (en) * | 2020-03-27 | 2022-02-01 | 中冶赛迪技术研究中心有限公司 | Hot rolling endless rolling shearing and pressing connection method and system thereof |
| DE102021207942A1 (en) * | 2021-07-23 | 2023-01-26 | Sms Group Gmbh | Method and device for producing a metallic strip |
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| EP1002590A1 (en) * | 1993-06-15 | 2000-05-24 | Kawasaki Steel Corporation | Continuous hot rolling method and apparatus |
| CN104815907A (en) * | 2015-05-05 | 2015-08-05 | 北京科技大学 | Quick connection die and method for hot rolled strip intermediate billets |
| CN105562953A (en) * | 2016-02-18 | 2016-05-11 | 西北工业大学 | Linear friction-current compound heat source welding method |
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| DE102007061512A1 (en) * | 2007-12-20 | 2009-07-30 | Pewag Austria Gmbh | Method for producing welded round and profile chains, chain link for a round or profile chain and round or profile chain constructed from such chain links |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1002590A1 (en) * | 1993-06-15 | 2000-05-24 | Kawasaki Steel Corporation | Continuous hot rolling method and apparatus |
| CN104815907A (en) * | 2015-05-05 | 2015-08-05 | 北京科技大学 | Quick connection die and method for hot rolled strip intermediate billets |
| CN105562953A (en) * | 2016-02-18 | 2016-05-11 | 西北工业大学 | Linear friction-current compound heat source welding method |
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