CN120984681A - Process for rolling ultrathin steel coil on hot continuous rolling production line - Google Patents

Abstract

The application relates to the technical field of metal rolling, in particular to a process for rolling ultrathin steel coils on a hot continuous rolling production line, which comprises a rolling mill arranged on one side of a roughing mill unit, wherein the rolling mill comprises a supporting frame, a plurality of groups of rolling rollers are rotationally arranged on the supporting frame, each group of rolling rollers consists of an upper roller and a lower roller, a gap is reserved between the upper roller and the lower roller, guide grooves positioned between the upper roller and the lower roller are symmetrically arranged on two sides of the supporting frame.

Description

Process for rolling ultrathin steel coil on hot continuous rolling production line

Technical Field

The application relates to the technical field of metal rolling, in particular to a process for rolling ultrathin steel coils by a hot continuous rolling production line.

Background

The rolling means that continuous pressure is applied to metal blanks with plasticity such as billets, aluminum ingots and the like by means of one or more pairs of rollers which rotate relatively, the metal is forced to perform controllable plastic deformation, and finally, a metal product meeting the requirements on shape, size and performance is obtained; the object to be processed is a metal blank having plasticity, and is subjected to heating, surface cleaning and other treatments in advance, so that no cracks and uniform components are ensured.

The core of rolling is that the plasticity of metal at high temperature or normal temperature is utilized, the shape is changed by extrusion and extension, and meanwhile, the internal structure is optimized to improve the mechanical property, for example, a stainless steel coil rolling device with oil removal and cleaning functions is disclosed in the application number CN202210818266.1, which relates to the technical field of metal rolling; the roller drives the rolled stainless steel strip to move to one side close to the cleaning mechanism, the cleaning mechanism cleans the surface of the stainless steel strip, and the cleaning mechanism cleans and adsorbs the residual rolling oil on the surface of the stainless steel strip, so that the oil content on the surface of the stainless steel strip meets the standard.

However, the prior art still has some defects when rolling ultra-thin steel coils:

The roller in the prior art is formed by splicing a plurality of independent rolling blocks, the rolling blocks need to do the reciprocating motion of attaching, separating and resetting in the sliding groove along with the pulleys, due to the characteristics of an ultrathin steel coil, periodical indentation or convex-concave defects can occur on the steel coil at the spliced joint of the roller, the smoothness of the surface of the steel coil is damaged, stress concentration is caused in subsequent processing, the local cracking of the strip is caused, and the appearance quality and the mechanical property suitability of a product are seriously affected.

Based on this, in the statement of the above point of view, the prior art still has room for improvement in the manner of rolling ultra-thin steel coils.

Disclosure of Invention

In order to solve the technical problems, the application provides a process for rolling ultrathin steel coils by a hot continuous rolling production line, which adopts the following technical scheme:

the process for rolling the ultrathin steel coil by using the hot continuous rolling production line is characterized by comprising the following steps of:

Firstly, pretreating a plate blank, namely removing surface iron scales and defects, and then heating and preserving heat;

Rolling the slab into an intermediate blank through a roughing mill set;

Step three, the intermediate billet enters a rolling mill for rolling, wherein the rolling mill comprises a supporting frame, a plurality of groups of rolling rollers are arranged on the supporting frame, each group of rolling rollers comprises an upper roller and a lower roller, a gap is arranged between the upper roller and the lower roller, and the gap between the upper roller and the lower roller is adjusted through an adjusting screw;

Step four, the rolled strip steel enters an edge trimmer for trimming, wherein the edge trimmer comprises a blade on a rotating shaft, which is matched with a carrier roller for primary cutting, and a cutting ring on a screw rod, which is matched with the rotating roller for secondary cutting, and the spacing of the cutting ring is adjusted through an adjusting ring;

And fifthly, coiling and cooling the trimmed strip steel.

Preferably, the two sides of the supporting frame are symmetrically provided with guide grooves between the upper roller and the lower roller;

The gaps on the multiple groups of rollers are sequentially reduced along the rolling direction, and the diameter of each group of rollers is correspondingly reduced along with the reduction of the gaps.

Preferably, the supporting frame is provided with sliding grooves corresponding to the upper rollers one by one, sliding blocks are arranged in the sliding grooves in a clearance fit sliding manner, and the upper rollers are arranged between the two corresponding sliding blocks in a rotating manner.

Preferably, the plurality of sliding blocks are arranged in a step mode, step height differences correspond to diameter differences of each group of rolling rollers, connecting frames corresponding to the upper rollers one by one are slidably matched at the upper ends of the supporting frames, and two ends of each connecting frame are fixedly connected with the sliding blocks at two ends of the same upper roller.

Preferably, the adjusting screw is rotatably arranged on the supporting frame and is in threaded connection with the connecting frame.

Preferably, the edge trimmer comprises a transmission shaft rotatably arranged at the upper end of one side of the supporting frame, the transmission shaft is installed through a torsion spring, suspensions are symmetrically arranged on the transmission shaft, and the rotation shaft is rotatably arranged between the two suspensions in a penetrating manner;

The supporting frame is rotationally provided with a carrier roller positioned under the rotating shaft, and the two blades are symmetrically arranged on the rotating shaft and positioned at the upper end of the carrier roller.

Preferably, the screw rod is rotatably arranged between the two suspensions in a penetrating way, and a rotating roller corresponding to the screw rod is rotatably arranged on the supporting frame;

the two ring cutters are arranged at two ends of the screw rod and are contacted with the rotating roller.

Preferably, the screw rod is symmetrically provided with a thread section, the cutting ring is slidably assembled on the thread section through a chute structure, and one side of the cutting ring is rotatably provided with an adjusting ring in threaded engagement with the thread section.

Preferably, the transmission shaft and the screw rod are both provided with press rollers, the press rollers on the transmission shaft correspond to the carrier rollers, and the press rollers on the screw rod correspond to the rotating rollers.

Preferably, the screw rod is in transmission connection with the transmission shaft through a belt, and the carrier roller is in transmission connection with the rotating roller through a belt.

Preferably, the screw rod is in transmission connection with the transmission shaft through a belt, and the carrier roller is in transmission connection with the rotating roller through a belt.

In summary, the present application includes at least one of the following beneficial technical effects:

1. According to the rolling mill disclosed by the invention, the gap between the rolling rollers can be flexibly adjusted by matching the adjusting screw, the connecting frame and the stepped sliding block so as to adapt to rolling requirements of strip steel with different thicknesses, the edge trimmer can conveniently change the clearance between the cutting rings by means of the threaded transmission of the threaded section of the screw rod and the adjusting ring, the cutting requirements of strip steel with different widths are met, the production of multi-specification ultrathin steel coil is integrally adapted, and the equipment changing cost is reduced.

2. The blade on the rotating shaft is matched with the carrier roller to finish primary cutting, obvious edge waves and burrs on the surface of the strip steel are removed rapidly, the cutting rings at the two ends of the screw rod are matched with the rotating roller to finish secondary finishing, fine irregular areas of primary cutting residues are eliminated, gaps between the blade and the surface of the rotating roller are reserved, the width deviation range of the strip steel is ensured, and the quality requirements of the edge part of the ultrathin strip steel are met.

3. According to the invention, screw thread sections with opposite rotation directions are symmetrically arranged on the screw rod, the cutting ring is assembled on the screw thread sections in a sliding way through the chute structure, one side of the cutting ring is connected with the adjusting ring through the thrust bearing, the adjusting ring is rotated to drive the cutting ring to translate along the screw thread sections, independent adjustment of the spacing between the cutting rings at two sides is realized, the cutting requirements of strip steel with different widths are met, the adjusting process does not need to disassemble parts, and the operation is efficient and the positioning is accurate.

Drawings

Fig. 1 is a schematic structural view of the present invention.

Fig. 2 is a schematic view of the structure of the rolling mill of the present invention.

Fig. 3 is an enlarged view of a portion of fig. 2 at a in accordance with the present invention.

FIG. 4 is a schematic plan view of a rolling mill according to the invention.

Fig. 5 is a schematic view of the structure between the rolling mill and the trimmer of the present invention.

Fig. 6 is a schematic view of the structure of the trimmer of the present invention.

Fig. 7 is an enlarged view of a portion of fig. 6B in accordance with the present invention.

Fig. 8 is a schematic plan view of an edger of the present invention.

The reference numerals are 1, a rolling mill, 11, a supporting frame, 12, a rolling roller, 121, an upper roller, 122, a lower roller, 13, a gap, 14, a guide groove, 15, a sliding groove, 16, a sliding block, 17, a connecting frame, 18, an adjusting screw, 2, an edge trimmer, 21, a transmission shaft, 22, a suspension, 23, a rotating shaft, 231, a blade, 24, a carrier roller, 25, a screw rod, 251, a ring cutter, 26, a rotating roller, 27, a thread section, 28, an adjusting ring, 29 and a pressing roller.

Detailed Description

The present application is described in further detail below with reference to fig. 1 to 8.

The embodiment of the application discloses a process for rolling an ultrathin steel coil in a hot continuous rolling production line, which realizes the accurate rolling and quality control of ultrathin steel strips by a rolling mill with a stepped adjustable rolling roller structure and an edge trimmer with a synchronous transmission and width adjustable double cutting mechanism.

Referring to fig. 1, a process for rolling ultrathin steel coils in a hot continuous rolling production line comprises the following steps:

Removing iron scales on the surface of a plate blank by a shot blasting machine, removing defects such as surface cracks and inclusions by flame cleaning or mechanical polishing, preventing the defects from being inherited to finished strip steel, carrying out size rechecking on the plate blank after cleaning, sending the pretreated plate blank into a step heating furnace, adopting a sectional heating mode, and preserving heat for 2-3 hours at a target temperature to ensure that austenite grains in the plate blank are uniform.

After the slab is discharged out of the furnace, removing surface secondary oxidized iron scales through a high-pressure water descaling device, then entering a roughing mill unit, controlling the width through a vertical roller mill in first pass, correcting the deviation of the width of the slab, applying initial pressure through a four-roller roughing mill, rolling in the whole roughing process through multiple passes, wherein the front pass mainly widens and primarily thins, the rear pass mainly thins precisely, reducing the bouncing of the mill through the rigidity advantage of a short stress line mill, avoiding the occurrence of middle waves and side waves of the slab shape, and finally rolling the slab into a flat intermediate blank.

And thirdly, before the intermediate billet enters a rolling mill 1 arranged on one side of the roughing mill unit, descaling and removing scale by high-pressure water again, wherein the rolling mill 1 follows a principle of front-large and rear-small pressing distribution, gradually applies pressure frame by frame, orderly reduces the thickness of the plate billet, and finally rolls the plate billet into ultrathin strip steel with target thickness.

Step four, after the steel coil is pressed and formed, discharging the steel coil from one end of a rolling mill 1, and cutting two sides of the strip steel by a trimming machine 2 arranged on one side of the rolling mill 1 through a cutter to remove edge waves, burrs and irregular areas formed by edge thinning possibly generated in the rolling process, so that the width of the strip steel is ensured to meet a preset standard, and meanwhile, the influence of edge defects on subsequent coiling and use is avoided;

The trimmed strip steel is then conveyed to a coiling machine for coiling operation, the pressure of a wrapper roller is flexibly adjusted according to the actual thickness of the strip steel, the thinner the strip steel is, the lower the pressure of the wrapper roller is, the generation of indentation or deformation on the surface of the strip steel is prevented, the pressure is properly increased when the strip steel is slightly thicker, the bonding degree of the initial coiling stage is ensured, after coiling is completed, the steel coil is bundled by a bundling machine, the steel coil is naturally cooled to the room temperature on a cooling bed, the quality is inspected to be qualified, and the steel coil is cooled to the room temperature and then is conveyed to a finished product warehouse.

Referring to fig. 2,3 and 4, specifically, the rolling mill 1 includes a supporting frame 11, a plurality of groups of rolling rolls 12 (three groups are shown in the drawing) for rolling a strip are rotatably mounted on the supporting frame 11 through bearings, an outer ring of the bearings is fixed on the supporting frame 11, an inner ring of the bearings is matched with shaft heads at two ends of the rolling rolls 12, each group of rolling rolls 12 is composed of an upper roll 121 and a lower roll 122, and a gap 13 is reserved between the upper roll 121 and the lower roll 122 to form a rolling channel through which the strip passes and is subjected to plastic deformation.

Along the conveying direction of the strip, gaps 13 on the groups of rollers 12 are sequentially reduced to form front-large and rear-small distribution, gaps 13 of the rollers 12 at the front end are larger, rapid thinning can be realized by utilizing initial good plasticity of the strip, the following gaps 13 are gradually reduced, thinning efficiency and stability can be balanced through moderate reduction after the thickness of the strip is reduced, meanwhile, along with the reduction of the gaps 13, the diameters of the rollers 12 of each group are correspondingly reduced, the rollers 12 at the front end can provide stronger rolling force to adapt to the initial large reduction requirement, the rollers 12 at the rear end are more convenient to realize fine roll gap adjustment, and the final thickness and the plate shape of the ultrathin strip are accurately controlled.

When the intermediate blank is rolled, the lower rollers 122 are driven to rotate, the lower rollers 122 are connected through a belt transmission to synchronously rotate, the intermediate blank enters from a larger inlet of a gap 13 at one side of the roller 12 group, and the intermediate blank is conveyed forwards along a rolling channel under the clamping and traction actions of the upper rollers 122 and the lower rollers 122 which synchronously rotate. With the advance of the conveying process, each group of rollers 12 with gradually reduced gaps 13 passes through one group of rollers 12, the upper roller 122 and the lower roller 122 apply a pressing force to the intermediate blank, so that the intermediate blank is continuously thinned and stretched under the continuous extrusion action.

The guide grooves 14 between the upper roller 121 and the lower roller 122 are symmetrically arranged on two sides of the supporting frame 11, one end of each guide groove 14 penetrates through the supporting frame 11, the strips can outwards extend through the guide grooves 14 after extending, the guide grooves 14 avoid influencing the extension of intermediate blanks, and finally rolling deformation from thicker intermediate blanks to ultrathin strips is completed.

The supporting frame 11 is provided with sliding grooves 15 corresponding to the upper rollers 121 one by one, sliding blocks 16 are slidably arranged in the sliding grooves 15, and the upper rollers 121 are rotatably arranged between the two corresponding sliding blocks 16.

The upper end of the supporting frame 11 is slidably provided with connecting frames 17 corresponding to the upper rollers 121 one by one, and two ends of the connecting frames 17 are fixedly connected with sliding blocks 16 at two ends of the same upper roller 121.

The supporting frame 11 is rotatably provided with an adjusting screw 18, the adjusting screw 18 is fixed on the supporting frame 11 through a bearing seat and can rotate around the axis of the supporting frame, the adjusting screw 18 is rotated to force the connecting frame 17 to move through threaded connection with the connecting frame 17, the external threads of the adjusting screw 18 are matched with the internal threads of the connecting frame 17, and as the two ends of the connecting frame 17 are fixed with the sliding blocks 16 of the same upper roller 121, the sliding blocks 16 at the two ends are driven to synchronously slide along the sliding grooves 15 when the connecting frame 17 moves, so that the upper roller 121 is driven to integrally approach or separate from the lower roller 122, and finally the increase or the decrease of the gap 13 between the group of rolling rollers 12 is realized.

When the adjusting screw 18 forces the connecting frame 17 to drive the upper roller 121 to move away from the lower roller 122, the sliding blocks 16 at the two ends synchronously slide upwards along the sliding grooves 15, namely, the distance between the upper roller 121 and the lower roller 122 is increased, namely, the gap 13 between the rollers 12 is increased, otherwise, if the adjusting screw 18 drives the connecting frame 17 to drive the upper roller 121 to move towards the lower roller 122, the sliding blocks 16 synchronously slide downwards along the sliding grooves 15, the distance between the upper roller 121 and the lower roller 122 is reduced, and the gap 13 between the rollers 12 is reduced.

The linkage structure realized through the screw transmission can accurately control the gap 13 change of a single group of rollers 12, and a plurality of sliding blocks 16 are arranged in a step, the step corresponds to the diameter difference of each group of rollers 12, each group of rollers 12 can still keep a gradient relation according with the principle of big front and small back after adjustment, and the thickness decreasing requirement in the intermediate billet rolling process is adapted.

Referring to fig. 5, fig. 6, fig. 7 and fig. 8, specifically, the edge trimmer 2 includes a transmission shaft 21 rotatably disposed at an upper end of one side of the supporting frame 11, the transmission shaft 21 is connected with the supporting frame 11 through a bearing seat, the bearing realizes rotation, the transmission shaft 21 is mounted through torsion springs (not shown in the drawing), two ends of the torsion springs are respectively connected with the transmission shaft 21 and the supporting frame 11, the suspension frames 22 are symmetrically disposed on the transmission shaft 21, the suspension frames 22 are fixed on the transmission shaft 21 through welding or bolts, one ends of the two suspension frames 22 rotate together to penetrate through a rotating shaft 23, the rotating shaft 23 is connected with the suspension frames 22 through the bearing, a carrier roller 24 disposed under the rotating shaft 23 is rotatably disposed on the supporting frame 11, two ends of the carrier roller are connected with the supporting frame 11 through the bearing, the blade 231 disposed at an upper end of the carrier roller 24 is symmetrically disposed on the rotating shaft 23, the blade 231 is fixed on the rotating shaft 23 through a key connection or a bolt, the pretightening force of the torsion springs is transmitted to the rotating shaft 23 through the transmission shaft 21 and the suspension frames 22, the rotating shaft 23 forces the rotating shaft 23 to drive the blade 231 to attach to the carrier roller direction, so that the blade edge of the blade 231 always closely contacts the carrier roller surface, and the carrier roller surface is ensured to be stable during cutting.

When the rolled strip is conveyed to the region of the trimming machine 2 through the guide groove 14, the edge of the strip just enters the gap 13 between the blades 231 and the carrier roller, at the moment, the rotating shaft 23 is driven to rotate by external power, the rotating shaft 23 synchronously drives the blades 231 on two sides to rotate at high speed, the cutting edge of the rotating blades 231 and the surface of the carrier roller form a shearing action, the carrier roller plays a supporting and conveying role on the strip, the strip is prevented from being deformed due to stress during cutting, and the blades 231 accurately cut the edge waves, burrs and irregular regions of the edge of the strip.

The elastic pre-tightening of the torsion spring can be self-adaptive to the small change of the thickness of the strip, so that the blade 231 and the carrier roller always keep proper cutting pressure, and the blade 231 and the carrier roller which are symmetrically arranged are matched in parallel, so that the edges on two sides of the strip can be synchronously and orderly cut, and the width of the strip is ensured to meet the standard requirement.

The blades 231 are mounted at the edge of the roller 12 and are matched with the carrier rollers to complete primary cutting, the two suspensions 22 are rotatably provided with screw rods 25, two ends of each screw rod 25 are connected with the suspensions 22 through bearings to achieve rotation, the supporting frame 11 is rotatably provided with a roller 26 corresponding to each screw rod 25, two ends of each roller are connected with the supporting frame 11 through bearing seats to achieve free rotation, the two ends of each screw rod 25 are symmetrically provided with a cutter ring 251 corresponding to each roller 26, the cutter rings 251 are slidably sleeved on the corresponding screw rods 25 through a sliding groove structure, the cutter edges face the roller surfaces, the cutter rings 251 are located on one side far away from the blades 231 and the roller 12 and are located on the inner sides of the two blades 231, and cutting stations distributed around the blades 231 for primary cutting are formed.

When cutting, the strip is conveyed to a trimming area through the roller 12, firstly, the blade 231 positioned at the edge of the roller 12 is matched with the carrier roller to perform primary cutting, most of irregular parts of the edge of the strip are removed, then, the strip is continuously conveyed between the ring cutter 251 and the rotating roller 26, the screw rod 25 rotates to drive the ring cutter 251 to synchronously rotate, and the shearing force formed by the ring cutter 251 and the rotating roller 26 performs secondary cutting on the edge of the strip.

The primary cutting treatment is carried out on the larger edge defect, the secondary cutting is carried out on the fine irregular part possibly remained after the primary cutting, the strip width is ensured to strictly meet the preset standard through the cooperation of the two working procedures, and the problem of size deviation possibly occurring in single cutting is avoided.

In addition, the screw rod 25 is symmetrically provided with a thread section 27, the screw rod 25 is axially processed and formed, threads on two sides are opposite in rotation direction, the inner ring of the ring cutter 251 is provided with a convex sliding block, the convex sliding block is embedded into an axial sliding groove on the surface of the thread section 27, sliding guiding and rotation prevention are realized, one side of the ring cutter 251 is rotatably provided with an adjusting ring 28 in threaded connection with the thread section 27, an inner ring of the adjusting ring 28 is processed, an inner thread is meshed with the thread section 27, and the adjusting ring is rotatably connected with the end face of the ring cutter 251 through a thrust bearing.

When the cutting width of the strip is required to be adjusted according to production requirements, the adjusting ring 28 is rotated, the rotating motion is converted into linear motion of the adjusting ring 28 along the threaded section 27 due to the meshing of the adjusting ring 28 and the threaded section 27 of the screw rod 25, and the cutting ring 251 is rotationally connected with the adjusting ring 28 (only driven to translate by the adjusting ring 28 and not rotate along with the adjusting ring 28), the adjusting ring 28 can drive the cutting ring 251 to synchronously slide on the threaded section 27, the positions of the corresponding side cutting rings 251 can be independently adjusted by respectively rotating the adjusting rings 28 on two sides, the distance between the two cutting rings 251 is further changed, the width of a finished strip is widened when the distance is increased, the width of the finished strip is narrowed when the distance is reduced, and finally the accurate adaptation of strips with different width specifications is realized.

The transmission shaft 21 and the screw rod 25 are respectively provided with a press roller 29, the press roller 29 on the transmission shaft 21 corresponds to the carrier roller 24, the press roller on the screw rod 25 corresponds to the rotating roller 26, two ends of the press roller are respectively connected with the transmission shaft 21 and the support on the screw rod 25 through bearings to realize rotation, when the strip passes through the cutting area of the blade 231 and the carrier roller, the press roller on the transmission shaft 21 can apply moderate pressure above the strip and stably clamp the strip by being matched with the carrier roller below, so that the strip is prevented from being tilted due to stress during cutting, and similarly, when the strip enters the secondary cutting area of the ring cutter 251 and the rotating roller, the press roller on the screw rod 25 and the rotating roller are matched to clamp the strip, the position stability of the edge of the strip during secondary finishing is ensured, and the cutting precision is improved.

The screw rod 25 is connected with the transmission shaft 21 through a belt transmission, when the transmission shaft 21 is driven to rotate by external power, the rotary motion of the transmission shaft 21 is directly transmitted to the screw rod 25 through the belt, so that the screw rod 25 synchronously rotates along with the transmission shaft 21, the rotating shaft 23 (and the blade 231) associated with the transmission shaft 21 and the ring cutter 251 rotating along with the screw rod 25 are completely consistent in rotation rhythm, and edge irregularity or cutting force fluctuation caused by strip cutting due to difference of cutter rotating speeds is avoided.

The carrier roller 24 and the rotating roller 26 are connected through belt transmission, the rotation power of the carrier roller can be indirectly synchronized to the rotating roller, or after one of the carrier roller and the rotating roller is driven by an independent power source, the other carrier roller is driven to rotate through the belt, so that the conveying speed of the carrier roller (matched blade 231) and the conveying speed of the rotating roller (matched ring knife 251) are completely matched, the carrier roller and the conveying speed of the belt are kept consistent with the travelling speed of the belt, the belt is prevented from slipping, accumulating or stretching between two cutting processes, and the cutting position is ensured to be accurate.

The embodiments of the present invention are all preferred embodiments of the present invention, and are not limited in scope by the present invention, so that all equivalent changes according to the structure, shape and principle of the present invention are covered by the scope of the present invention.

Claims (10)

1. The process for rolling the ultrathin steel coil by using the hot continuous rolling production line is characterized by comprising the following steps of:

Firstly, pretreating a plate blank, namely removing surface iron scales and defects, and then heating and preserving heat;

Rolling the slab into an intermediate blank through a roughing mill set;

Step three, the intermediate billet enters a rolling mill (1) for rolling, the rolling mill (1) comprises a supporting frame (11), a plurality of groups of rolling rollers (12) are arranged on the supporting frame (11), each group of rolling rollers (12) comprises an upper roller (121) and a lower roller (122), a gap (13) is arranged between the upper roller (121) and the lower roller (122), and the gap (13) between the upper roller (121) and the lower roller (122) is adjusted through an adjusting screw (18);

Step four, the rolled strip steel enters an edge trimmer (2) for trimming, the edge trimmer (2) comprises a blade (231) on a rotating shaft (23) and a carrier roller (24) for primary cutting in a matching way, a cutting ring (251) on a screw rod (25) and a rotating roller (26) for secondary cutting in a matching way, and the distance between the cutting ring (251) is adjusted through an adjusting ring (28);

And fifthly, coiling and cooling the trimmed strip steel.

2. The process for rolling ultrathin steel coils on the hot continuous rolling production line according to claim 1, which is characterized in that guide grooves (14) positioned between an upper roller (121) and a lower roller (122) are symmetrically formed on two sides of a supporting frame (11);

the gaps (13) on the multiple groups of rollers (12) are sequentially reduced along the rolling direction, and the diameter of each group of rollers (12) is correspondingly reduced along with the reduction of the gaps (13).

3. The process for rolling ultrathin steel coils on the hot continuous rolling production line according to claim 1, wherein the supporting frame (11) is provided with sliding grooves (15) which are in one-to-one correspondence with the upper rollers (121), sliding blocks (16) are arranged in the sliding grooves (15) in a matched sliding manner by adopting gaps (13), and the upper rollers (121) are rotatably arranged between the two corresponding sliding blocks (16).

4. A process for rolling ultrathin steel coils on a hot continuous rolling production line according to claim 3, wherein a plurality of sliding blocks (16) are arranged in a step mode, the step height difference corresponds to the diameter difference of each group of rolling rollers (12), connecting frames (17) which correspond to the upper rollers (121) one by one are slidably matched at the upper ends of the supporting frames (11), and two ends of each connecting frame (17) are fixedly connected with the sliding blocks (16) at two ends of the same upper roller (121).

5. A process for rolling ultrathin steel coils in a hot continuous rolling production line according to claim 4, wherein the adjusting screw (18) is rotatably arranged on the supporting frame (11) and is in threaded connection with the connecting frame (17).

6. The process for rolling ultrathin steel coils on the hot continuous rolling production line according to claim 1, wherein the edge trimmer (2) comprises a transmission shaft (21) rotatably arranged at the upper end of one side of a supporting frame (11), the transmission shaft (21) is installed through a torsion spring, suspensions (22) are symmetrically arranged on the transmission shaft (21), and the rotation shaft (23) is rotatably arranged between the two suspensions (22);

the supporting frame (11) is rotatably provided with a carrier roller (24) positioned under the rotating shaft (23), and the two blades (231) are symmetrically arranged on the rotating shaft (23) and positioned at the upper end of the carrier roller (24).

7. The process for rolling ultrathin steel coils on the hot continuous rolling production line according to claim 6, wherein the screw rod (25) is rotatably arranged between the two suspensions (22), and a rotary roller (26) corresponding to the screw rod (25) is rotatably arranged on the supporting frame (11);

The two ring cutters (251) are arranged at two ends of the screw rod (25) and are contacted with the rotating roller (26).

8. The process for rolling ultrathin steel coils on the hot continuous rolling production line as set forth in claim 7, wherein the screw rod (25) is symmetrically provided with a threaded section (27), the cutting ring (251) is slidingly assembled on the threaded section (27) through a chute structure, and one side of the cutting ring (251) is rotatably provided with an adjusting ring (28) in threaded engagement with the threaded section (27).

9. The process for rolling ultrathin steel coils on the hot continuous rolling production line according to claim 7, wherein the transmission shaft (21) and the screw rod (25) are respectively provided with a press roller (29), the press roller (29) on the transmission shaft (21) corresponds to the carrier roller (24), and the press roller on the screw rod (25) corresponds to the rotary roller (26).

10. The process for rolling ultrathin steel coils on the hot continuous rolling production line according to claim 9, wherein the screw rod (25) is connected with the transmission shaft (21) through belt transmission, and the carrier roller (24) is connected with the rotating roller (26) through belt transmission.