A method of rolling to reduce longitudinal unevenness of an ultra-thick plate alloy

Abstract

The application discloses a rolling method for reducing longitudinal unevenness of super-thick plate alloy, comprising the following steps: determining the pass number of initial transition pass, strong deformation pass and finished product pass, and the reduction and rolling force of each pass; controlling the plate to enter each initial transition pass in sequence; controlling the plate to enter each strong deformation pass; controlling the plate to continue to move, and increasing the roll gap distance of the roll in the finished product pass by a preset distance before the plate enters the finished product pass; when the plate moves to the front end of the roll in the finished product pass by a preset length, the roll gap distance is reduced by the preset distance; after the plate completes the rolling in the pass, the plate is controlled to be reversely rolled; after the plate completes the rolling in the pass again, the plate is controlled to be reversely moved to the next finished product pass or the rolling is completed; and the preset distance is greater than the reduction of the corresponding finished product pass. The method avoids the buckle defect caused by the head biting of the plate, reduces the longitudinal unevenness, reduces the straightening process, and saves time, energy and labor cost.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of rolling methods, in particular to a rolling method for reducing the longitudinal unevenness of super-thick plate alloys. BACKGROUND

[0002] Due to the limitation of the size of the casting ingot, the rolling of super-thick plate alloys often cannot meet the minimum incoming length of the stretcher, and cannot be stretched and straightened, so the plate shape after hot rolling is the final product plate shape.

[0003] In the prior art, due to the limitation of the type of rolling mill, the middle and lower horizontal lines of the rolling mill cannot be adjusted, and the climbing type bite will be down, so it is often difficult to meet the requirements of products with high longitudinal unevenness. The current production method does not consider the capacity limit of the equipment, resulting in unevenness exceeding the standard of multiple batches of products, and due to the limit of the equipment, the straightening and stretching cannot be performed, resulting in loss of product yield, inability to supply in time, and if the product is normally shipped, the user cannot use it, thereby causing quality complaints, affecting the income and image of the enterprise.

[0004] Therefore, how to effectively reduce the unevenness of super-thick plate alloys and improve the yield is a technical problem that needs to be solved by those skilled in the art at present. SUMMARY

[0005] The purpose of the present application is to provide a rolling method for reducing the longitudinal unevenness of super-thick plate alloys, which can improve the rolling quality of super-thick plate alloys, reduce unevenness, and meet the requirements of subsequent processing.

[0006] To achieve the above purpose, the present application provides the following technical scheme:

[0007] A rolling method for reducing the longitudinal unevenness of super-thick plate alloys, comprising the following steps:

[0008] Step S1: determining the number of passes of initial transition passes, strong deformation passes and finished product passes, and the reduction amount and rolling force of each pass;

[0009] Step S2: controlling the plate to enter each of the initial transition passes in turn, and rolling the head and tail of the plate body to match the shape of the roller;

[0010] Step S3: controlling the plate to enter each of the strong deformation passes, until the thickness of the plate body is the target thickness of strong deformation;

[0011] Step S4: controlling the plate to continue moving, and before entering each of the product passes, controlling the roll gap distance of the rolls in the product passes to increase by a preset distance, when the plate moves to a preset length before the front end of the rolls of the product passes, controlling the roll gap distance to decrease by the preset distance, after the plate completes the pass rolling, controlling the plate to reverse rolling, after the plate completes the pass rolling again, controlling the plate to move reversely to the next product pass or complete rolling; the preset distance is greater than the reduction of the corresponding product pass.

[0012] Preferably, the step S4 further comprises, before the plate moves to the preset length before the front end of the product passes, controlling the feeding speed of the rolls in the product passes to be 15-25 m / min, when the plate moves to the preset length before the front end of the rolls of the product passes, controlling the feeding speed of the rolls to return to the target speed.

[0013] Preferably, in the step S4, the preset length is 20%-40% of the total length of the plate.

[0014] Preferably, in the step S1, the number of the initial transition passes is 1 or 2, and the number of the product passes is 2 or 3.

[0015] Preferably, the reduction of each of the initial transition passes is 10-15 mm.

[0016] Preferably, the reduction of each of the strong deformation passes is 30-50 mm.

[0017] Preferably, the reduction of each of the product passes is 4-6 mm.

[0018] Preferably, the rolling force of each of the product passes is 600-1000 T.

[0019] Preferably, the step further comprises:

[0020] turning off the AGC thickness control program in the product passes.

[0021] Preferably, the step further comprises:

[0022] turning off the emulsion spraying program in the product passes.

[0023] The rolling method for reducing the longitudinal unevenness of the super-thick plate alloy comprises the following steps: step S1: determining the pass quantity of the initial transition pass, the strong deformation pass and the finished product pass, and the reduction and rolling force of each pass; step S2: controlling the plate to enter the initial transition pass in sequence, and rolling the head and tail of the plate to match the shape of the roller; step S3: controlling the plate to enter the strong deformation pass, and the thickness of the plate is the target thickness of the strong deformation; step S4: controlling the plate to continue to move, and before entering the finished product pass, the roll gap distance of the roller in the finished product pass is increased by a preset distance, when the plate moves to the front end of the roller of the finished product pass by a preset length, the roll gap distance is reduced by the preset distance, after the plate completes the rolling of the pass, the plate is controlled to be reversely rolled, after the plate completes the rolling of the pass again, the plate is controlled to be reversely moved to the next finished product pass or to complete the rolling; the preset distance is greater than the reduction of the corresponding finished product pass. The rolling method provided by the application reduces the biting process of the plate in the finished product pass, and starts to roll the plate after the plate moves over the finished product pass by a preset length, and then completes the rolling process of the front end of the plate in the pass through the reverse rolling process. The front and rear ends of the plate do not need to be bitten, thereby effectively avoiding the buckle defect caused by biting of the plate, fundamentally reducing the longitudinal unevenness of the super-thick plate alloy, and reducing the straightening process, saving time, energy and labor cost.

[0024] In a preferred embodiment, the step S4 further comprises, before the plate moves to the front end of the finished product pass by a preset length, controlling the feeding speed of the roller in the finished product pass to be 15-25 m / min, and when the plate moves to the front end of the roller of the finished product pass by a preset length, controlling the feeding speed of the roller to return to the target speed. The above setting controls the roller in the finished product pass to rotate at the lowest speed to feed before the plate moves to the set position, thereby ensuring that the roll gap distance is reduced by the preset distance at the set position, and avoiding that the roll gap distance cannot be recovered in time due to the too fast moving speed of the plate, and causing the buckle or turnover defect of the plate. BRIEF DESCRIPTION OF DRAWINGS

[0025] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or prior art description. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor.

[0026] Figure 1A flowchart illustrating a specific embodiment of the rolling method for reducing longitudinal unevenness of ultra-thick plate alloys provided by the present invention;

[0027] Figure 2 This is a flowchart of another specific embodiment of the rolling method for reducing longitudinal unevenness of ultra-thick plate alloys provided by the present invention. Detailed Implementation

[0028] The core of this invention is to provide a rolling method for reducing the longitudinal unevenness of ultra-thick plate alloys, which can reduce the longitudinal unevenness of ultra-thick plate alloys, improve the yield, and is low in cost and easy to control.

[0029] To enable those skilled in the art to better understand the present invention, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0030] Please refer to Figure 1 and Figure 2 , Figure 1 A flowchart illustrating a specific embodiment of the rolling method for reducing longitudinal unevenness of ultra-thick plate alloys provided by the present invention; Figure 2 This is a flowchart of another specific embodiment of the rolling method for reducing longitudinal unevenness of ultra-thick plate alloys provided by the present invention.

[0031] In this embodiment, the rolling method for reducing the longitudinal unevenness of ultra-thick plate alloys includes the following steps:

[0032] Step S1: Determine the number of initial transition passes, high deformation passes, and finished product passes, as well as the reduction and rolling force for each pass; the specific settings can be made according to the type of sheet metal, rolling thickness, and rolling equipment conditions.

[0033] Step S2: Control the sheet material to enter each initial transition pass in sequence, and roll the head and tail of the sheet material to match the shape of the rolls; specifically, the edges of the rectangular blank can be rolled from sharp corners to rounded arcs, which can better match the rolls and make it easier to bite in the strong deformation passes;

[0034] Step S3: Control the sheet material to enter each strong deformation pass, and perform strong deformation on the sheet material until the thickness of the sheet material is the target thickness of the strong deformation; the target thickness of the strong deformation is the finished thickness of the sheet material minus the total rolling thickness of each finished product pass;

[0035] Step S4: control the plate to continue to move, and before entering each finished pass, control the roll gap distance of the roll in the finished pass to increase by a preset distance, when the plate moves to the front end of the roll in the finished pass by a preset length, control the roll gap distance to decrease by a preset distance, after the plate completes the pass rolling, control the plate to reverse rolling, after the plate completes the pass rolling again, control the plate to move reversely to the next finished pass or complete the rolling; the preset distance is greater than the reduction of the corresponding finished pass.

[0036] Specifically, the super-thick plate alloy refers to a plate with a thickness of ≥120mm, before the plate enters each finished pass, the roll gap distance of the roll in the finished pass is controlled to increase by a preset distance, which is greater than the reduction of the corresponding finished pass, that is, before the plate starts to enter the roll in the finished pass, the thickness of the plate is less than the roll gap distance, so the plate does not have the problem of biting, and after the plate continues to move to the roll in the finished pass by a preset length, the roll gap distance is adjusted to the appropriate reduction, the plate is rolled from the middle part, and then the plate is reversely moved, at this time, the roll gap distance of the roll at the rear end of the plate does not change, when the plate is reversely moved, it also does not need to bite, when the plate moves by a certain length, which refers to the total length of the plate minus the preset length, at this time, the finished pass at the front end of the plate starts to roll the front end of the plate, thereby completing the thickness adjustment of the pass; after completing the pass processing, the roll continues to rotate, the plate continues to the next finished pass, and the step S4 is repeated to continue to complete the processing of the next pass, and when the processing of all passes is completed, the plate can be discharged.

[0037] The rolling method provided by the application reduces the biting process of the plate in the finished pass, and starts to roll the plate after the plate moves by a preset length in the finished pass, and then completes the rolling process of the front end of the plate through the reverse rolling process, so that the front and rear ends of the plate do not need to bite, thereby effectively avoiding the buckle defect of the plate caused by biting, fundamentally reducing the longitudinal unevenness of the super-thick plate alloy, and reducing the straightening process, saving time, energy and labor cost.

[0038] In some embodiments, step S4 further includes, before the plate moves to the front end of the finished pass by a preset length, controlling the feeding speed of the roll in the finished pass to be 15-25m / min, and when the plate moves to the front end of the roll in the finished pass by a preset length, controlling the feeding speed of the roll to return to the target speed. The above setting controls the roll in the finished pass to rotate at the lowest speed to feed before the plate moves to the set position, thereby ensuring that the roll gap distance decreases by a preset distance at the set position, avoiding the fact that the roll gap distance cannot be restored in time due to the too fast moving speed of the plate, and causing the plate to have buckle or flip defects.

[0039] In some embodiments, in step S4, the preset length is 20% to 40% of the total length of the plate, preferably 30% to 35%. In this way, on the one hand, the preset length is not too large, which causes the front end of the plate to be lowered, and on the other hand, the preset length is not too short, which causes the front end of the plate to be raised.

[0040] In some embodiments, in step S1, the number of passes in the initial transition pass is 1 or 2, and the number of passes in the finished product pass is 2 or 3.

[0041] Specifically, the total number of passes is N, the number of passes in the strong deformation pass is the total number of passes N minus the number of passes in the initial transition pass and the number of passes in the finished product pass. The total number of passes N depends on the total thickness of the plate, the material of the plate, the performance of the roller, and other factors.

[0042] In some embodiments, the reduction in each pass in the initial transition pass is 10-15mm. The reduction in each pass in the initial transition pass can be relatively small, which facilitates subsequent biting.

[0043] In some embodiments, the reduction in each pass in the strong deformation pass is 30-50mm. The strong deformation pass allows the as-cast structure to be changed into a processing structure as soon as possible, and the reduction can be increased.

[0044] In some embodiments, the reduction in each pass in the finished product pass is 4-6mm, preferably 5mm. By setting a small reduction, the rolling quality of the plate is ensured, and the dimensional accuracy is improved.

[0045] In some embodiments, the rolling force in each pass in the finished product pass is 600-1000T. Specifically, the rolling force in the finished product pass is selected, the reduction in the finished product pass is preferably 5mm, the rolling force cannot be too large, and the rolling force can be selected to be 600-1000T. In this way, the material rolled in the longitudinal direction has little difference in plate difference, and the plate shape is good.

[0046] In some embodiments, the method further comprises the steps of:

[0047] In some embodiments, the method further comprises the steps of:

[0048] In some embodiments, the method further comprises the steps of:

[0049] The emulsion spraying procedure in the finished product pass is closed. Specifically, the emulsion is normally used in the initial transition pass and the heavy deformation pass, and when entering the final finished product pass, the main machine speed is too slow, and the use of emulsion will sinter to form oil spots, at which time the emulsion is not sprayed.

[0050] In a specific embodiment, by reducing the initial transition pass, the large reduction amount organization improvement stage, i.e. the heavy deformation pass, is entered as soon as possible. Due to the finished product thickness of the ultra-thick plate, the total processing rate is limited, and the first 1-2 passes use a small reduction amount of about 10-15 mm, so that the head and tail of the rough material form a contact width similar to the shape of the roller to meet the biting condition of the heavy deformation stage; the third pass uses a large reduction amount to enter the heavy deformation stage, so that the as-cast structure is changed into a processing structure as soon as possible, and the reduction amount is controlled at about 30-50 mm; the finished product pass control mode: the last two passes are pressed to a thickness of about 10 mm of the target thickness value, and then enter the shape control and thickness control stage, i.e. the finished product pass stage, the reduction amount is controlled at 5 mm, the roller is lifted by about 8 mm using oil pressure when the head is bitten, the roller is rotated at the lowest speed to feed, when the first third of the length of the plate material is reached, the roller gap distance is pressed to the target thickness using oil pressure, and the roller does not stop rotating, and the material is pressed while walking; the reverse rolling repeats the process, which effectively avoids the buckle defect caused by the head biting.

[0051] The above describes in detail the rolling method for reducing the longitudinal unevenness of the ultra-thick plate alloy provided by the present application. In this paper, specific examples are used to illustrate the principles and implementation methods of the present application, and the above examples are only used to help understand the method and core idea of the present application. It should be noted that for ordinary skilled persons in the technical field, some improvements and modifications can be made to the present application without departing from the principles of the present application, and these improvements and modifications also fall within the protection scope of the claims of the present application.

Claims

1. A rolling method for reducing the longitudinal unevenness of an ultra-thick plate alloy, characterized by, The method comprises the following steps: Step S1: determining the pass number of initial transition passes, strong deformation passes and finished product passes, and the reduction and rolling force of each pass; Step S2: controlling the plate to enter each initial transition pass in turn, and rolling the head and tail of the plate to match the shape of the roller; Step S3: controlling the plate to enter each strong deformation pass, until the thickness of the plate is the target thickness of strong deformation; Step S4: controlling the plate to continue to move, and before entering each finished product pass, controlling the roll gap distance of the roller in the finished product pass to increase by a preset distance, when the plate moves to the front end of the roller of the finished product pass by a preset length, controlling the roll gap distance to decrease by the preset distance, after the plate completes the pass rolling, controlling the plate to reverse rolling, after the plate completes the pass rolling again, controlling the plate to move reversely to the next finished product pass or complete rolling; the preset distance is greater than the reduction corresponding to the finished product pass.

2. The method of claim 1 wherein, The step S4 further comprises, before the plate moves to the front end of the finished product pass by a preset length, controlling the feeding speed of the roller in the finished product pass to be 15-25 m / min, and after the plate moves to the front end of the roller of the finished product pass by a preset length, controlling the feeding speed of the roller to return to the target speed.

3. The method of claim 1 wherein the alloy is an ultra-thick plate alloy. In the step S4, the preset length is 20%-40% of the total length of the plate.

4. The method of claim 1 wherein the alloy is an ultra-thick plate alloy. In the step S1, the pass number of the initial transition pass is 1 or 2, and the pass number of the finished product pass is 2 or 3.

5. The method of claim 1 wherein, The reduction of each pass in the initial transition pass is 10-15 mm.

6. The method of claim 1 wherein, The reduction of each pass in the strong deformation pass is 30-50 mm.

7. The method of claim 1 wherein, The reduction of each pass in the finished product pass is 4-6 mm.

8. The method of claim 1 wherein, The rolling force of each pass in the finished product pass is 600-1000 T.

9. The method of claim 1 to 8, wherein, Further comprising the steps of: Turning off the AGC thickness control program in the finished product pass.

10. The method of claim 1 to 8, wherein Further comprising the steps of: Turning off the emulsion spraying program in the finished product pass.

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