CN112496088B - Control method for improving C-warped plate shape of galvanized plate through zero-elongation withdrawal and straightening - Google Patents
Control method for improving C-warped plate shape of galvanized plate through zero-elongation withdrawal and straightening Download PDFInfo
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- CN112496088B CN112496088B CN202011289956.XA CN202011289956A CN112496088B CN 112496088 B CN112496088 B CN 112496088B CN 202011289956 A CN202011289956 A CN 202011289956A CN 112496088 B CN112496088 B CN 112496088B
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- straightening
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D1/00—Straightening, restoring form or removing local distortions of sheet metal or specific articles made therefrom; Stretching sheet metal combined with rolling
- B21D1/02—Straightening, restoring form or removing local distortions of sheet metal or specific articles made therefrom; Stretching sheet metal combined with rolling by rollers
Abstract
The invention discloses a control method for improving the C warped plate shape of a galvanized plate by zero elongation withdrawal and straightening, which comprises the following steps: the welding line of the produced steel reaches the position of a tension leveler, the function of zero elongation tension leveling is selected through an operation interface or an operation panel button, the tension leveler automatically sets the elongation to be 0, the tension is adjusted to a preset value, meanwhile, a straightening roller of the tension leveler is pressed against the strip steel, and the insertion amount is controlled to be the preset value. The control method for improving the C-warped plate shape of the galvanized plate by zero-elongation withdrawal and straightening effectively improves the C-warped plate shape of the strip steel, avoids the scratch of the strip steel and creates better plate shape conditions for the subsequent deep processing of the strip steel.
Description
Technical Field
The invention relates to a control method for improving the C-warped plate shape of a galvanized plate by zero elongation withdrawal and straightening.
Background
The generation of the galvanized sheet C warp is caused by different extensions of the upper surface and the lower surface in the width direction of the strip steel, and the lower C warp is represented by large upper surface extension and small lower surface extension; otherwise, it appears as upward C warping.
The plate shape problem is easy to scratch on-line equipment in the production process, and scratch defects are generated; the subsequent deep processing processes such as strip steel stamping and the like have poor forming performance. In order to improve the C-warp problem, there are several measures.
For a double-roller transmission finishing machine, the speed difference of rolling on the upper surface and the lower surface can be formed by modifying the roller diameter difference of the supporting rollers, so that the lower C warping or the upper C warping is improved in a targeted manner. But does not work for a single roller driven finisher.
The working rollers with different roller diameters are selected, the upper part and the lower part can increase the extension of the lower surface, and the C warping is improved. However, the method is limited by the backup roll, the improvement degree is not controllable, and the C-warped plate shape cannot be improved completely in time.
The throwing of the withdrawal and straightening machine is an effective means for improving the shape of the C-shaped wane, but the withdrawal and straightening machine can generate a superposition effect with the plastic deformation in the full thickness direction of the strip steel in the deep processing process of subsequent stamping and the like, so that withdrawal and straightening line defects are caused. Therefore, in the quality design process of part of automobile sheet steel grades, the withdrawal and straightening elongation rate must be definitely specified to be 0, so that a withdrawal and straightening machine cannot be used.
Disclosure of Invention
The invention aims to provide a control method for improving the C-warped plate shape of a galvanized plate by zero-elongation withdrawal and straightening, which effectively improves the C-warped plate shape of strip steel, avoids the scratch of the strip steel and creates better plate shape conditions for the subsequent deep processing of the strip steel.
The technical scheme adopted by the invention for solving the technical problems is as follows: a control method for improving the C warping shape of a galvanized sheet by zero elongation withdrawal and straightening comprises the following steps: the method comprises the following steps that a welding seam of a produced steel grade reaches the position of a tension leveler, the function of zero elongation tension leveler is selected to be put into use through an operation interface or an operation panel button, the tension leveler automatically sets the elongation percentage to be 0, the tension is adjusted to a preset value, meanwhile, a straightening roller of the tension leveler is pressed against strip steel, and the insertion amount is controlled to be a preset value;
the tension leveler automatically sets the elongation rate to be 0, so that the performance of the steel is guaranteed without interference, and the tension can be automatically adjusted by the system through subsequent adjustment of the insertion amount of the straightening roll, so that the elongation rate is guaranteed to be 0.
Specifically, the elongation of the tension leveler is set to be 0, the tension of the tension leveler is automatically adjusted along with the adjustment of the insertion amount of the straightening unit of the tension leveler, the minimum tension value is not lower than 5KN, and the actual elongation of the tension leveler is not more than 0.1%;
according to the following formula, the withdrawal and straightening elongation is less than 0.1%, the steel material is still in an elastic deformation stage, and the performance cannot be greatly influenced, so that the withdrawal and straightening elongation less than 0.1% can meet the requirement in the actual control process, and the withdrawal and straightening machine is also a theoretical basis for putting the withdrawal and straightening machine into use with zero elongation without generating adverse influence on the subsequent service performance of the product;
the tension of the tension leveler is adjusted to a preset value, the preset value is 10KN, and then the tension is automatically adjusted by the system along with the adjustment of the insertion amount of the straightening roll;
the lowest value of the tension adjustment is not lower than 5KN, and the stable operation of the strip steel is ensured.
Specifically, a straightening roller of the withdrawal and straightening machine is pressed against the strip steel, the insertion amount is controlled to a preset value, the preset value is 4mm, and then manual adjustment is performed according to the improvement condition of the C warp, and the adjustment range is 2-10 mm.
The invention has the following beneficial effects: according to the control method for improving the C-warped plate shape of the galvanized plate by zero elongation withdrawal and straightening, disclosed by the invention, (1) an operator can timely adjust the insertion amount of a straightening roller of a withdrawal and straightening machine according to the C-warped condition, so that the timeliness and the effectiveness of plate shape control are ensured; (2) the zero elongation withdrawal straightening machine control can ensure that the subsequent service performance of the product is not adversely affected; (3) after the shape of the C warped strip steel is improved, the scratch defect of the strip steel in the production process can be effectively avoided; and simultaneously, the forming performance of the strip steel in the subsequent deep processing process is effectively improved. (4) The method has strong applicability, and can be popularized and applied to a continuous galvanizing production line provided with a withdrawal and straightening machine.
Drawings
Fig. 1 is a schematic view of the area of a withdrawal and straightening unit.
Wherein: 1. an inlet tension roller set; 2. an outlet tension roller set; 3. a withdrawal and straightening machine; 4. strip steel
FIG. 2 is a schematic control diagram of a straightening roll of a withdrawal straightening unit.
Wherein: 5. 1# bending roller; 6. 2# bending roller; 7. a straightening roll; 8. and (4) supporting the roller.
Fig. 3 is a schematic view of a C-paddle.
Detailed Description
A control method for improving the C-warped plate shape of a galvanized plate by zero-elongation withdrawal straightening is disclosed, and a withdrawal straightening machine shown in figure 2 is provided with two bending units and a straightening unit.
After the target steel coil enters the withdrawal and straightening machine, an operator selects a zero elongation withdrawal and straightening function to put into use through an operation interface or an operation panel button.
All control units of the tension leveler are opened, and the tension leveler automatically sets the elongation rate to be 0.
And then, tension of the withdrawal and straightening section is automatically adjusted to a preset value of 10KN by the front and rear tension roller sets of the withdrawal and straightening machine.
Meanwhile, as shown in fig. 2, the opening state of the bending roller unit of the withdrawal and straightening machine is maintained, the straightening rollers of the withdrawal and straightening machine automatically press upwards against the strip steel, and the insertion amount is controlled to be 4 mm.
Along with the adjustment of the insertion amount of the straightening roller, the system can also automatically adjust the tension so as to ensure that the elongation is basically 0 and absolutely not more than 0.1 percent.
The lowest value of the tension adjustment is not lower than 5KN, and the stable operation of the strip steel is ensured.
According to the improvement condition of the C warp, an operator continues to manually adjust the insertion amount of the straightening roll of the withdrawal and straightening machine within the adjustment range of 2-10mm, so that the defect of the C warp shape of the strip steel is timely and completely improved.
Claims (1)
1. A control method for improving the C-warped shape of a galvanized plate by zero-elongation withdrawal and straightening is characterized by comprising the following steps: the method comprises the following steps that a welding seam of a produced steel grade reaches the position of a tension leveler, the function of zero elongation tension leveler is selected to be put into use through an operation interface or an operation panel button, the tension leveler automatically sets the elongation percentage to be 0, the tension is adjusted to a preset value, meanwhile, a straightening roller of the tension leveler is pressed against strip steel, and the insertion amount is controlled to be a preset value;
the tension leveler automatically sets the elongation rate to be 0, so that the performance of the steel is guaranteed without interference, and the tension can be automatically adjusted by the system through subsequent adjustment of the insertion amount of the straightening roll so as to ensure the elongation rate to be 0;
the actual elongation of the withdrawal and straightening machine is not more than 0.1%;
the tension of the tension leveler is adjusted to a preset value, the preset value is 10KN, and then the tension is automatically adjusted by the system along with the adjustment of the insertion amount of the straightening roll;
the tension adjustment value is not lower than 5KN, so that the stable operation of the strip steel is ensured;
and a straightening roller of the withdrawal and straightening machine is pressed against the strip steel, the insertion amount is controlled to be a preset value, the preset value is 4mm, and then manual adjustment is performed according to the improvement condition of the C warp, and the adjustment range is 2-10 mm.
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| CN202011289956.XA CN112496088B (en) | 2020-11-18 | 2020-11-18 | Control method for improving C-warped plate shape of galvanized plate through zero-elongation withdrawal and straightening |
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| CN112496088B true CN112496088B (en) | 2022-04-12 |
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| DE102010024714C5 (en) * | 2010-06-23 | 2018-10-18 | Bwg Bergwerk- Und Walzwerk-Maschinenbau Gmbh | Method for stretch bending of metal strips and stretch bending plant |
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