Device for improving strip-shaped defects on lower surface of aluminum alloy strip

Abstract

The utility model relates to a device for improving strip-shaped defects on the lower surface of an aluminum alloy strip, which is sequentially provided with an inlet tensioning roller set, a first guide plate, a second guide plate and a working roller set from a feeding side to a discharging side, and the second guide plate is a guide plate fixedly arranged below the aluminum alloy strip. An oil spray nozzle for spraying rolling oil to the lower surface of the aluminum alloy strip is fixedly arranged below the second guide plate; the first guide plate is installed on the liftable sliding block and located below the aluminum alloy strip, and an adjustable lifting roller used for adjusting the tension force of the strip is fixedly arranged on the liftable sliding block and located above the aluminum alloy strip. And meanwhile, the capacity of equipment is widened, the quality of products of various models is guaranteed, and the problem of strip-shaped color difference defects of the lower surface of the high-Mg aluminum alloy strip is thoroughly solved.

Description

TECHNICAL FIELD

[0002] The utility model relates to a device for improving strip defects on the lower surface of aluminum alloy strip. BACKGROUND

[0004] When the applicant produces aluminum alloy with Mg content greater than or equal to 4% (high Mg aluminum alloy), it is found that strip-shaped continuous or intermittent color difference defects often occur in the middle region of the aluminum strip width during finished product acceptance, which seriously affects the use of customers and has a great impact on the yield of the product. Since the product is rolled from 3.5mm to 0.2mm thickness, it needs to go through multiple rolling, cleaning, annealing and other processes, and the poor product quality causes huge losses to the company.

[0005] After repeated observation, it is found that the strip-shaped continuous or intermittent color difference defects of the aluminum alloy strip are mainly concentrated on the lower surface of the aluminum alloy strip. The reason is that during cold rolling, the rolling oil sprayed by the rolling mill tends to accumulate on the upper surface of the aluminum alloy strip. Because the upper surface of the aluminum alloy strip has too much oil, on the one hand, it can timely remove the aluminum powder, avoiding the adhesion of aluminum powder on the roller, and on the other hand, it can form an oil film between the roller and the strip, achieving isolation between the strip and the roller.

[0006] The lower surface of the aluminum alloy strip, which has an oil injection mechanism at the front end of the tensioning roller inlet, has residual rolling oil squeezed out after passing through the tensioning roller. The oil film between the strip and the roller is thin during rolling. Because the high Mg alloy itself has high strength, the oil film is easily broken and it is difficult to form an isolation layer between the roller and the strip. On the other hand, high Mg alloy is prone to produce aluminum powder during rolling. Under the current equipment structure, the aluminum powder is difficult to be removed, leaving marks on the lower surface of the aluminum alloy strip, i.e. continuous or intermittent strip-shaped color difference.

[0007] Although subsequent cleaning of the surface of the aluminum alloy strip can reduce the area of the strip-shaped continuous or intermittent color difference defects to some extent, the addition of the cleaning process not only increases the cost and production time, but also cannot fundamentally solve the problem.

[0008] Currently, the Chinese patent "A method for solving the strip-shaped defects on the surface of cold-rolled coil" (publication number CN119216382A) is retrieved. The method includes the following steps: redesigning the composition and hardness of the product, adjusting the hot rolling out-of-furnace temperature, increasing the cooling water volume and reducing the coiling temperature during laminar cooling after hot rolling, etc. The invention provides a method for solving the strip-shaped defects on the surface of cold-rolled coil, which improves the hardness of low-carbon steel material and improves the density of material organization, so that the iron oxide scale cannot be pressed into the surface of the hot-rolled coil, the slab heating out-of-furnace temperature is reduced, and the hot-rolled coil coiling temperature is reduced, thereby solving the pressing of the iron oxide scale on the hot-rolled coil, so that the hot-rolled coil will not produce strip-shaped defects during further cold rolling. However, it cannot improve the strip-shaped defects on the lower surface of the aluminum alloy strip. SUMMARY

[0010] In view of the above-mentioned deficiencies of the prior art, the purpose of the present application is to provide a device for improving strip defects on the lower surface of aluminum alloy strip material, which is rationally designed and is conducive to improving strip defects on the lower surface of aluminum alloy strip material.

[0011] The device for improving strip defects on the lower surface of aluminum alloy strip material is characterized in that: an inlet tension roller group, a first guide plate, a second guide plate and a working roller group are sequentially arranged from the inlet side to the outlet side of the aluminum alloy strip material, the second guide plate is a guide plate fixedly arranged below the aluminum alloy strip material, an oil nozzle for spraying rolling oil to the lower surface of the aluminum alloy strip material is fixedly arranged below the second guide plate, the first guide plate is installed on a liftable sliding block and located below the aluminum alloy strip material, an adjustable lifting roller for adjusting the tension of the strip material is fixedly arranged on the liftable sliding block and above the aluminum alloy strip material, the first guide plate has two working positions, in the first working position, the first guide plate is higher than or flush with the second guide plate and the adjustable lifting roller does not press against the aluminum alloy strip material, in the second working position, the first guide plate is lower than the second guide plate and the first guide plate does not shield the oil nozzle from spraying rolling oil to the lower surface of the aluminum alloy strip material, and the adjustable lifting roller presses against the aluminum alloy strip material.

[0012] Preferably, a fixed frame is installed below the second guide plate, and the oil nozzle is installed on the fixed frame.

[0013] Preferably, an oil injection pipe parallel to the shaft center line of the adjustable lifting roller is installed on the fixed frame, a plurality of oil nozzles are arranged on the oil injection pipe, an oil inlet nozzle is fixedly arranged on the lower part of the oil injection pipe, and the oil inlet nozzle is connected with a main pipe of rolling oil.

[0014] Preferably, a central oil hole communicating with the inner cavity of the oil injection pipe is arranged at the center of the oil nozzle, a sink groove communicating with the central oil hole is arranged on the free end surface of the oil nozzle, and the symmetric center surface of the sink groove forms a 10-degree angle with a first plane passing through the shaft center line of the central oil hole and the shaft center line of the oil injection pipe.

[0015] Preferably, the sink groove is a rectangular sink groove or a trapezoidal sink groove, and the width of the sink groove groove bottom is equal to the diameter of the central oil hole.

[0016] Preferably, the first plane forms a 30-60 degree angle with a vertical plane.

[0017] Preferably, the liftable sliding block is slidingly connected to a vertical guide rail, the vertical guide rail is fixedly arranged on a rack, a hydraulic cylinder is fixedly connected to the rack, and the free end of the telescopic rod of the hydraulic cylinder is connected to the liftable sliding block.

[0018] Preferably, 7 oil injection nozzles are evenly arranged on the middle part of the oil injection pipe at every 60mm interval; and 4 oil injection nozzles are arranged at every 120mm interval on the outermost side of the 7 oil injection nozzles.

[0019] Preferably, the inlet tension roller set comprises two lower tension rollers located below the aluminum alloy strip and an inlet upper tension roller located above the aluminum alloy strip and between the two lower tension rollers, and the working roller set comprises at least an upper working roller and a lower working roller oppositely rolled.

[0020] The working method of the device for improving strip defects on the lower surface of an aluminum alloy strip,

[0021] In the non-rolling state, i.e. the first guide plate and the adjustable lifting roller are in the first position, at this time the first guide plate is higher than or flush with the second guide plate and the adjustable lifting roller does not press the aluminum alloy strip, at this time the aluminum alloy strip sequentially passes through the inlet tension roller set, the first guide plate, the second guide plate and the working roller set from the feeding side, realizing the guiding of the strip.

[0022] In the rolling state, i.e. the first guide plate and the adjustable lifting roller are in the second position, at this time the first guide plate is lower than the second guide plate and the first guide plate does not block the oil injection nozzles from spraying rolling oil to the lower surface of the aluminum alloy strip, and the adjustable lifting roller presses the aluminum alloy strip; the rolling oil sprayed by the oil injection nozzles is sprayed to the lower surface of the aluminum alloy strip, realizing the flushing of the lower surface of the aluminum alloy strip, reducing the amount of residual aluminum powder on the surface of the aluminum alloy strip, and the sprayed rolling oil adheres to the lower surface of the aluminum alloy strip, which can play a good lubricating and isolating role during the rolling of the aluminum alloy strip.

[0023] The working principle of the device for improving strip defects on the lower surface of an aluminum alloy strip, in the non-rolling state, i.e. the first guide plate and the adjustable lifting roller are in the first position, at this time the first guide plate is higher than or flush with the second guide plate and the adjustable lifting roller does not press the aluminum alloy strip, so that the aluminum alloy strip sequentially passes through the inlet tension roller set, the first guide plate and the second guide plate and then enters the working roller set, realizing the guiding of the strip, in this process the aluminum alloy strip is not blocked and can be supported and guided by the first guide plate and the second guide plate, ensuring that the end of the aluminum alloy strip can be accurately guided into the working roller set and avoiding the failure of the aluminum alloy strip to be accurately guided into the working roller set; in the rolling state, i.e. the first guide plate and the adjustable lifting roller are in the second position, at this time the first guide plate is lower than the second guide plate and the first guide plate does not block the oil injection nozzles from spraying rolling oil to the lower surface of the aluminum alloy strip, which can make the rolling oil sprayed by the oil injection nozzles sprayed to the lower surface of the aluminum alloy strip, realizing the flushing of the lower surface of the aluminum alloy strip, reducing the amount of residual aluminum powder on the surface of the aluminum alloy strip, and the sprayed rolling oil adheres to the lower surface of the aluminum alloy strip, which can play a good lubricating and isolating role during the rolling of the aluminum alloy strip; and the adjustable lifting roller can press the aluminum alloy strip, realizing the adjustment of the wrap angle and the tension force of the aluminum alloy strip.BRIEF DESCRIPTION OF DRAWINGS BRIEF DESCRIPTION OF DRAWINGS

[0025] Figure 1 is a schematic view of the prior art structure;

[0026] Figure 2 is a schematic view of the first station structure of the present application;

[0027] Figure 3 is a schematic view of the second station structure of the present application;

[0028] Figure 4 is a partial view of Figure 3 ;

[0029] Figure 5 is a M-direction partial view of Figure 4 ;

[0030] Figure 6 is a N-direction partial sectional view of Figure 5 ;

[0031] Figure 7 is a bottom view of Figure 5 . DETAILED DESCRIPTION

[0033] The method of the present application will be further described in detail below in conjunction with the embodiments. It should be particularly noted that the protection scope of the present application should include but not be limited to the technical content disclosed in the embodiments.

[0034] In the prior art, the aluminum alloy strip 1 is sequentially provided with an entry tensioning roller set 2, a guide plate A and a working roller set 5 from the entry side to the exit side, i.e. only one fixed guide plate A is installed between the entry tensioning roller set 2 and the working roller set 5, the guide plate A is not movable, and the distance between the guide plate A and the entry tensioning roller set 2 and the working roller set 5 is narrow (only 2-5 mm), the guide plate only functions to facilitate the guiding of the strip during entry, avoiding the strip sagging and failing to be accurately guided into between the upper working roller 51 and the lower working roller 52, and the device for improving the strip defects of the lower surface of the aluminum alloy strip according to the present application has the following specific technical solutions.

[0035] The aluminum alloy strip 1 is sequentially provided with the entry tensioning roller set 2, a first guide plate 3, a second guide plate 4 and the working roller set 5 from the entry side to the exit side, as shown in the figure.

[0036] The entry tensioning roller set 2 includes two lower tensioning rollers 21 located below the aluminum alloy strip and one entry upper tensioning roller 22 located above the aluminum alloy strip, the entry upper tensioning roller is located between the two lower tensioning rollers, and the working roller set 5 includes at least the upper working roller 51 and the lower working roller 52 which are oppositely rolled.

[0037] The second guide plate 4 is fixedly arranged below the aluminum alloy strip, one end of the second guide plate 4 is close to the work roller set 5, the other end of the second guide plate 4 is close to one end of the first guide plate 3, the other end of the first guide plate 3 is close to the inlet tension roller set 2, and an oil nozzle 6 for spraying rolling oil to the lower surface of the aluminum alloy strip is fixedly arranged below the second guide plate 4.

[0038] The first guide plate 3 is installed on the liftable sliding block 7 and below the aluminum alloy strip, and the adjustable lifting roller 8 for adjusting the tension of the strip is fixedly arranged on the liftable sliding block 7 and above the aluminum alloy strip, that is, the guide plate A is replaced by the first guide plate 3, the second guide plate 4 and the adjustable lifting roller 8, and the distance between the adjustable lifting roller 8 and the first guide plate 3 is 10-300 mm.

[0039] The first guide plate has two working positions, in the first working position, the first guide plate is higher (1-3 mm higher) or flush with the second guide plate, and the adjustable lifting roller does not press the aluminum alloy strip, and in the second working position, the first guide plate is lower than the second guide plate, and the first guide plate does not block the oil nozzle from spraying rolling oil to the lower surface of the aluminum alloy strip, and at the same time, the adjustable lifting roller presses the aluminum alloy strip.

[0040] In the specific work, in the non-rolling state, that is, the first guide plate and the adjustable lifting roller are in the first working position (the upper working position), at this time, the first guide plate is higher or flush with the second guide plate, and the adjustable lifting roller does not press the aluminum alloy strip (the first guide plate blocks the oil nozzle from spraying rolling oil to the lower surface of the aluminum alloy strip, at this time, the oil nozzle does not spray oil, so as not to waste the rolling oil), thereby facilitating the aluminum alloy strip to pass through the inlet tension roller set, the first guide plate and the second guide plate in turn and then enter the work roller set, realizing the guiding of the strip, in this process, the aluminum alloy strip is not blocked and can be supported and guided by the first guide plate and the second guide plate (the same as the existing guide plate), ensuring that the end of the aluminum alloy strip can be accurately guided into the space between the upper work roller 51 and the lower work roller 52 of the work roller set, avoiding the failure of the aluminum alloy strip to be accurately guided into the work roller set; in the rolling state, the first guide plate and the adjustable lifting roller are in the second working position (the lower working position), at this time, the first guide plate is lower than the second guide plate, and the first guide plate does not block the oil nozzle from spraying rolling oil to the lower surface of the aluminum alloy strip (that is, the space for the oil nozzle to spray rolling oil to the lower surface of the aluminum alloy strip is open), so that the rolling oil sprayed by the oil nozzle can be sprayed to the lower surface of the aluminum alloy strip, realizing the flushing of the lower surface of the aluminum alloy strip and reducing the amount of aluminum powder remaining on the surface of the aluminum alloy strip, and the sprayed rolling oil adheres to the lower surface of the aluminum alloy strip, which can play a good lubricating and isolating role during the rolling of the aluminum alloy strip; at the same time, the adjustable lifting roller can press the aluminum alloy strip, realizing the adjustment of the corner wrapping and tension of the aluminum alloy strip.

[0041] The utility model discloses first guide plate and adjustable lifting roller's structural design and two kinds of work stations, realized multiple functions, that is satisfied for guiding the function of strip material, can also satisfy the problem of being able to spray the rolling oil to the lower surface of strip material under the condition of limited installation space of oil nozzle, to improve the lower surface strip defect, can also adjust the strip material package angle and tension.

[0042] The fixed frame 9 is fixed on the rack, and the oil nozzle 6 is installed on the fixed frame 9, and specifically, the fixed frame is provided with an oil injection pipe 61 parallel to the adjustable lifting roller shaft center line, a plurality of oil injection nozzles 6 are arranged on the oil injection pipe, and an oil inlet nozzle 62 is fixed to the lower part of the oil injection pipe 61, the oil inlet nozzle is connected with a main pipe (not shown in the figure) of rolling oil, the rolling oil enters the inner cavity of the oil injection pipe 61 through the main pipe and the oil inlet nozzle 62, and is then sprayed from each oil injection nozzle 6.

[0043] In order to design reasonably, the center of the oil injection nozzle 6 is provided with a center oil hole 63 communicated with the inner cavity of the oil injection pipe, the free end surface of the oil injection nozzle is provided with a sink 64 (the sink 64 is a rectangular sink or a trapezoidal sink, and the sink bottom width is equal to the diameter of the center oil hole) communicated with the center oil hole 63, and the symmetry center surface 66 of the sink forms a 10-degree angle with a first plane 65 passing through the center oil hole shaft center line and the oil injection pipe shaft center line; when the angle between the first plane 65 and the symmetry center surface 66 of the sink is between 0-9 degrees, the sprayed oil will overlap (that is, the oil sprayed from two adjacent oil injection nozzles will interfere with each other), which is not conducive to the uniform distribution of oil.

[0044] In order to better spray, avoid the oil injection nozzle 6 from being blocked by the second guide plate 4, the first plane 65 and the vertical surface 67 form an angle of 30-60 degrees, and the oil injection nozzle 6 does not interfere with the first guide plate in the vertical direction.

[0045] In order to design reasonably, 7 oil injection nozzles are evenly arranged on the oil injection pipe every 60mm; 4 oil injection nozzles are arranged every 120mm on the outermost side of the 7 oil injection nozzles, and the arrangement of the oil injection nozzles has the advantages that the length of the oil injection pipe matches the width of the aluminum strip, the small distribution interval of the oil injection nozzles in the middle is conducive to increasing the spraying amount in the middle, increasing the flushing of the lower surface and the amount of rolling oil adhered to the lower surface of the strip, and the large interval of the two side parts reduces the diversion of rolling oil, which is conducive to ensuring the spraying amount in the middle.

[0046] The liftable sliding block 7 is slidably connected to the vertical guide rail 71, the vertical guide rail 71 is fixed on the rack, the rack is fixedly connected with a hydraulic cylinder 72 or an electric push rod, the free end of the telescopic rod of the hydraulic cylinder is connected with the liftable sliding block 7, and the lifting of the liftable sliding block 7, the adjustable lifting roller 8 and the first guide plate 3 is driven by the hydraulic cylinder 72.

[0047] The device is installed on the ground with an oil collecting pool, so that the sprayed oil and impurities mixed therein are collected into the oil collecting pool (subsequently recycled and filtered for reuse).

[0048] The device makes good use of the adjustable lifting roller and the first guide plate, and fully utilizes the gap generated by the adjustable lifting roller and the first guide plate to realize the spraying of rolling oil, fundamentally solves the problem of strip-shaped continuous or intermittent color difference defects, does not need cleaning program, is favorable for controlling cost and production efficiency, widens the capacity of the equipment, guarantees the quality of various types of products, and completely solves the problem of strip-shaped color difference defects on the lower surface of high-Mg aluminum alloy strip.

[0049] The above is only a preferred embodiment of the present application, and any changes and modifications made within the scope of the present application should be included in the scope of the present application.

Claims

1. A device for improving strip-shaped defects on the lower surface of aluminum alloy strip, characterized in that: From the aluminum alloy strip feeding side to the discharging side, an inlet tension roller set, a first guide plate, a second guide plate and a working roller set are sequentially arranged, the second guide plate is a guide plate fixedly arranged below the aluminum alloy strip, an oil nozzle for spraying rolling oil to the lower surface of the aluminum alloy strip is fixedly arranged below the second guide plate; the first guide plate is installed on a liftable sliding block and below the aluminum alloy strip, an adjustable lifting roller for adjusting the tension of the strip is fixedly arranged on the liftable sliding block and above the aluminum alloy strip, the first guide plate has two stations, in the first station, the first guide plate is higher than or flush with the second guide plate and the adjustable lifting roller does not press against the aluminum alloy strip, in the second station, the first guide plate is lower than the second guide plate and the first guide plate does not shield the oil nozzle from spraying rolling oil to the lower surface of the aluminum alloy strip, and the adjustable lifting roller presses against the aluminum alloy strip.

2. The apparatus for improving the subsurface streaks of aluminum alloy strip of claim 1, wherein: A fixing frame is installed below the second guide plate, and the oil nozzle is installed on the fixing frame.

3. The apparatus for improving the subsurface streaks of aluminum alloy strip of claim 2, wherein: A oil spraying pipe parallel to the shaft center line of the adjustable lifting roller is installed on the fixing frame, a plurality of oil nozzles are arranged on the oil spraying pipe, and an oil inlet nozzle is fixedly arranged on the lower part of the oil spraying pipe, and the oil inlet nozzle is connected with a main pipe of rolling oil.

4. The apparatus for improving the subsurface streaks of aluminum alloy strip of claim 3, wherein: A central oil hole communicating with the inner cavity of the oil spraying pipe is arranged at the center of the oil nozzle, a sink groove communicating with the central oil hole is arranged on the free end surface of the oil nozzle, and the symmetric center surface of the sink groove forms a 10-degree angle with a first plane passing through the shaft center line of the central oil hole and the shaft center line of the oil spraying pipe.

5. The apparatus for improving the subsurface streaks of aluminum alloy strip of claim 4, wherein: The sink groove is a rectangular sink groove or a trapezoidal sink groove, and the width of the sink groove groove bottom is equal to the diameter of the central oil hole.

6. The apparatus for improving the subsurface streaks of aluminum alloy strip of claim 5, wherein: The first plane forms a 30-60 degree angle with a vertical plane.

7. The apparatus for improving the subsurface streaks of aluminum alloy strip of claim 6, wherein: The liftable sliding block is slidingly connected to a vertical guide rail, the vertical guide rail is fixed to a rack, a hydraulic cylinder or an electric push rod is fixedly connected to the rack, and the free end of the telescopic rod of the hydraulic cylinder or the electric push rod is connected to the liftable sliding block.

8. The apparatus for improving the subsurface streaks of aluminum alloy strip of claim 7, wherein: Seven oil nozzles are uniformly arranged on the middle part of the oil spraying pipe every 60 mm, and four oil nozzles are arranged every 120 mm on the outermost side of the seven oil nozzles.

9. The apparatus for improving the subsurface streaks of aluminum alloy strip of claim 8, wherein: The inlet tension roller set includes two lower tension rollers below the aluminum alloy strip and an inlet upper tension roller above the aluminum alloy strip, and the inlet upper tension roller is located between the two lower tension rollers.

10. The apparatus for improving the subsurface streaks of aluminum alloy strip of claim 9, wherein: The working roller set at least includes an upper working roller and a lower working roller oppositely rolled.

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