Method for overcoming defect of flat packing paper marks of 430 stainless steel cold plate thin material

Abstract

The invention belongs to the technical field of stainless steel processing, and provides a method for overcoming the defect of a flat packing paper mark of a 430 stainless steel cold plate thin material, which comprises the following steps: the actual paper force is 80% of the given paper force when a motor of a coiling and uncoiling packing paper machine of a temper mill accelerates and decelerates; in the threading process, two workers in front of the machine use crowbars to gently pry the belt head to cooperate with main operation, and it is ensured that the belt head does not deviate; the use amount of the corrugated paper is controlled to be 1-2; the operation process of the temper mill is optimized; according to the method, by improving equipment and process parameters, the functional precision of a flattening unit of a company is improved, the one-time reject ratio of flattening packing paper printing of the 430 stainless steel cold plate thin material is obviously reduced, the operation efficiency of the flattening unit is improved, the production cost is saved, meanwhile, the customer objection rate is reduced, and the customer satisfaction degree is improved.

Description

Technical Field

[0001] The invention belongs to the technical field of stainless steel processing, relates to the leveling process control of 430 stainless steel cold plate thin material, and specifically is a method for solving the pad printing defect of the leveling of 430 stainless steel cold plate thin material. Background Art

[0002] 430 stainless steel is a widely used general product with a large market demand. It has good corrosion resistance, thermal conductivity, heat resistance and fatigue resistance. 430 stainless steel is mainly used in architectural decoration, home appliances, household appliances, fuel burner parts, hot water tanks, hot water supply systems, sanitary appliances and other fields.

[0003] At present, the company mainly uses the 3# leveler in the wide area of ​​the cold rolling mill to produce the leveling process required for the wide and thin specifications of 430 cold-rolled plates. During the production process, it was found that the steel strips often had obvious pad paper print defects after leveling, which seriously affected the surface quality of the products. The subsequent re-leveling and rework caused a significant increase in production costs, and the surface quality of the steel strips after leveling failed to completely and effectively improve the original pad paper print defects. As a result, product users raised many objections to the received 430 thin specifications products, and the pad paper print defect problem urgently needed to be solved. Summary of the invention

[0004] The purpose of the present invention is to provide a method for solving the defects of pad paper printing during the leveling of 430 stainless steel cold plate thin material, improve the quality level of the surface flatness of 430 stainless steel cold plate thin material, improve the efficiency of the leveling machine, reduce various cost consumption caused by rework, and meet the customer's usage requirements with high standards.

[0005] The technical solution adopted by the present invention to achieve the above-mentioned purpose is: A method for solving the flat pad printing defect of 430 stainless steel cold plate thin material, comprising: S1, offline leveler, adjust the motor program of coiling and uncoiling paper padding machine; S2. During the threading process, two machine operators use a crowbar to gently pry the belt head and cooperate with the main operator to ensure that the belt head does not deviate; S3. Use only 1-2 sheets of corrugated paper; S4. Optimize the operation process of the leveling machine.

[0006] Furthermore, when the motors of the winding and unwinding paper padding machines are accelerated or decelerated, the actual paper force is adjusted to 80% of the given paper force.

[0007] Further, the leveling machine operation process includes: 1) In the first pass, the acceleration process ensures uniform acceleration, and the speed is controlled at 280m / min-350m / min. The paper winding force is less than 1N during acceleration, and the paper winding force is given to 4N-5N during uniform speed. When decelerating, the paper winding force is first given to 5N-6N, and decelerating at the same time. When decelerating to less than 200m / min, the paper force is reduced to 3N-4N, and the unwinding paper force is given to 16N-18N; 2) In the second pass, the paper tension for unwinding is set at 1-2N, the paper tension for winding is set at 4-5N, the maximum speed is controlled to 300m / min, the paper tension for winding increases gradually from 5N-6N to 8N-9N with the increase of speed, and the paper tension for unwinding is set at 3N-4N; 3) In the third pass, the acceleration process ensures uniform acceleration, and the maximum speed is controlled between 300m / min-320. The paper winding force is less than 1N during acceleration, and the paper winding force is given to 4N-5N during uniform speed. When decelerating, the paper winding force is first given to 5N-6N, and decelerates at the same time. When decelerating to below 200m / min, the paper force is reduced to 3N-4N, and the paper unwinding force is 16N-18N.

[0008] The beneficial effects of the present invention are: The present invention improves the functional accuracy of the company's leveling unit by improving equipment and process parameters. The one-time unqualified rate of 430 stainless steel cold plate thin material leveling pad paper printing is significantly reduced, which improves the operating efficiency of the leveling unit, saves production costs, reduces customer objection rate, and improves customer satisfaction. DETAILED DESCRIPTION

[0009] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0010] A method for solving the flat pad printing defect of 430 stainless steel cold plate thin material, comprising: S1. The actual paper force of the winding and unwinding paper padding machine motor during acceleration and deceleration is 80% of the given paper force; That is, the offline flattening machine changes the motor program of the winding and unwinding paper padding machine, changing the given tension to be the same as the actual tension to the actual paper force being 80% of the given paper force during acceleration and deceleration.

[0011] S2. During the threading process, two workers in front of the machine use a crowbar to gently pry the belt head and cooperate with the main operator to ensure that the belt head does not deviate.

[0012] S3. Use only 1-2 sheets of corrugated paper; The purpose of padding 1-2 sheets of corrugated paper here is to ensure that the steel coil is tightly wound without bulges. If there are bulges, more than 3 sheets of corrugated paper need to be padded to eliminate the bulges. At this time, the steel coil cannot be tightly wound, and it is very easy for the coil to loosen during the production process, and normal production cannot be achieved. In this case, the tape head needs to be cut off and re-threaded.

[0013] S4. Optimize the online operation process of the leveling machine, including: 1) The first pass was originally uniformly accelerated from 0m / min to 500m / min, and the corresponding curling paper force increased from 1N to 10N, and the unwinding paper force was 16N-18N. The deceleration process was the opposite of the acceleration process. After optimization: the acceleration process ensures uniform acceleration, the speed is controlled at 280m / min-350m / min, the winding paper force is less than 1N during acceleration, the winding paper force is given to 4N-5N during the uniform speed process, and the winding paper force is first given to 5N-6N during deceleration, and deceleration is performed at the same time. When the deceleration is below 200m / min, the paper force is reduced to 3N-4N, and the unwinding paper force is given to 16N-18N; 2) The second pass was originally: uniform acceleration from 0m / min to 500m / min, corresponding to the increase of the curling paper force from 10N to 20N, the unwinding paper force from 3N to 5N, and the deceleration process was the opposite of the acceleration process. After optimization: the unwinding paper force was given 1-2N, the winding paper force was given 4-5N, the maximum speed was controlled to 300m / min, the winding paper force gradually increased from 5N-6N to 8N-9N with the increase of speed, and the unwinding paper force was given 3N-4N; 3) The original third pass was: uniform acceleration from 0m / min to 500m / min, the corresponding curling paper force increased from 1N to 10N, the unwinding paper force was 16N-18N, and the deceleration process was the opposite of the acceleration process. After optimization: the acceleration process ensures uniform acceleration, the maximum speed is controlled between 300m / min-320, the winding paper force is less than 1N during acceleration, the winding paper force is given to 4N-5N during the uniform speed process, and the winding paper force is first given to 5N-6N during deceleration, and deceleration is performed at the same time. When the deceleration is below 200m / min, the paper force is reduced to 3N-4N, and the unwinding paper force is 16N-18N.

[0014] Through the effective implementation of the above methods, the precise control of the unit equipment is achieved, and the flat surface quality of 430 cold plate thin material (0.32mm-0.41mm) is greatly improved, which fundamentally solves the problem of pad paper printing defects of 3# flat 430 cold plate thin material for many years, and at the same time improves the flatness efficiency of 430 thin material and reduces the cost consumption caused by rework. The monthly unqualified rate of 430 cold plate thin material surface flatness is controlled below 3%, the product surface quality is greatly improved, and the quality objection rate of pad paper printing is reduced to below 0.5%. Example

[0015] When producing 430BA boards with a specification of 1540mm*0.38mm, two front-end workers are required to cooperate with the main operator during the tape threading process to ensure that the tape head does not deviate, and the actual paper force during acceleration and deceleration is 80% of the given paper force. In the first pass, the acceleration process ensures uniform acceleration, the speed is controlled at 300m / min, the paper force of the winding paper is less than 1N during acceleration, and the paper force of the winding paper is given to 5N during the uniform speed process; in the second pass, the height of the tension anti-wrinkle roller of the first unwinding reel is reversed, the unwinding paper force is given to 2N, the winding paper force is given to 5N, the maximum speed is controlled to 300m / min, and the winding paper force gradually increases from 5N to 8N with the increase of speed, and the unwinding paper force speed is given to 4N at the maximum; in the third pass, the acceleration process ensures uniform acceleration, and the maximum speed is controlled at 300m / min.

[0016] The one-time unqualified rate of the 430 cold plate thin material pad paper print in the embodiment was reduced from the previous 9% to less than 2%; through the improvement of equipment, process parameters and the improvement of on-site management, the functional accuracy of the leveling unit was improved, and precise control of various parameters was achieved; users of 430 thin stainless steel affirmed the elimination of the product pad paper print defects, and the objection rate was reduced; the operating efficiency of the unit was improved, and production costs were saved.

[0017] The above descriptions are merely embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A method for solving the defect of flat pad paper printing of 430 stainless steel cold plate thin material, characterized by: include: S1, Offline leveler adjusts the motor program of coiling and uncoiling paper padding machine; S2. During the threading process, two machine operators use a crowbar to gently pry the belt head and cooperate with the main operator to ensure that the belt head does not deviate; S3. Use only 1-2 sheets of corrugated paper; S4. Optimize the operation process of the leveling machine.

2. A method for solving the paper printing defect of 430 stainless steel cold plate thin material flatness according to claim 1, characterized in that: When the motor of the reeling and unreeling paper pad machine accelerates and decelerates, the actual paper force is adjusted to 80% of the given paper force.

3. A method for solving the paper printing defect of 430 stainless steel cold plate thin material flatness according to claim 1, characterized in that: The S4 specifically includes: S41, the first pass, the acceleration process ensures uniform acceleration, the speed is controlled at 280m / min-350m / min, the paper winding force is less than 1N during acceleration, the paper winding force is given to 4N-5N during uniform speed process, and the paper winding force is given to 5N-6N during deceleration, and deceleration is performed at the same time. When the deceleration is below 200m / min, the paper force is reduced to 3N-4N, and the unwinding paper force is given to 16N-18N; S42, the second pass, the unwinding paper tension is set to 1-2N, the winding paper tension is set to 4-5N, the maximum speed is controlled to 300m / min, the winding paper tension gradually increases from 5N-6N to 8N-9N with the increase of speed, and the unwinding paper tension is set to 3N-4N; S43, the third pass, the acceleration process ensures uniform acceleration, the maximum speed is controlled between 300m / min-320, the paper winding force is less than 1N during acceleration, the paper winding force is given to 4N-5N during uniform speed process, and the paper winding force is given to 5N-6N during deceleration, and deceleration is performed at the same time. When the deceleration is below 200m / min, the paper force is reduced to 3N-4N, and the paper unwinding force is 16N-18N.