Device for rolling invar alloy ultra-thin strip by double-sided electrified auxiliary twenty-high roll mill

Abstract

The invention relates to the technical field of strip rolling, and discloses a device for rolling an invar alloy ultra-thin strip by using a double-sided electrified auxiliary twenty-high rolling mill, which comprises a rolling mill, a double-sided electrified auxiliary twenty-high rolling mill, a double-sided electrified auxiliary twenty-high rolling mill, a double-sided electrified auxiliary twenty-high rolling mill, a double-sided electrified auxiliary twenty-high rolling mill and a double-sided electrified auxiliary twenty-high rolling mill, the electrifying resistance rollers are arranged on the left side and the right side of the rolling mill and connected with the upper surface or the lower surface of the strip, the electrifying resistance rollers are communicated with a power source, and the electrifying resistance rollers, the strip and the power source form a strip electrifying heating loop; a plurality of resistor elements are sequentially arranged in the electrified resistance roller in the length direction of the electrified resistance roller, the resistor elements are sequentially connected in series and connected with an external control center, the control center is used for controlling the resistance of the resistor elements, the electrified resistance roller is made of conductive materials, and the resistor elements are attached to the inner surface of the electrified resistance roller. The transverse temperature of the strip can be adjusted in a partitioned mode, and the problem of current instability is solved.

Description

Technical Field

[0001] This invention relates to the field of strip rolling technology, and in particular to an apparatus for rolling Invar alloy ultrathin strips using a double-sided electrically assisted 20-roll mill. Background Technology

[0002] 4J36 Invar alloy ultra-thin strip is a nickel-iron alloy with an extremely low coefficient of thermal expansion, serving as a core substrate material for manufacturing high-end precision metal masks (FMMs). During production, the front and back sides of the Invar alloy strip need to be rolled to form different structures. The 20-roll mill, as the mainstream equipment for ultra-thin strip production, possesses high rigidity, large reduction capacity, and excellent strip shape control capabilities. However, when rolling Invar alloy, its significant work hardening, high deformation resistance, and poor thermal conductivity make it highly susceptible to uneven transverse stress distribution during rolling. This results in strip shape defects such as transverse curling and wavy edges. These defects severely affect the dimensional stability and graphic accuracy of the final FMM product, limiting its application in high-precision display fields.

[0003] To address the aforementioned technical issues, existing technologies utilize electrically heated resistance rollers at both ends of the rolling mill to improve heating uniformity and thus enhance the stress distribution uniformity of Invar alloys. However, because the two sides of the Invar alloy strip require rolling to form different structures, the two sides of the strip are prone to partial separation from the electrically heated resistance rollers, leading to unstable current. Furthermore, the required heating temperatures for the transverse cross-section of the strip differ (affected by the rolled structure), making it impossible to achieve zoned heating of the strip using electrically heated resistance rollers.

[0004] In view of this, how to partially or completely overcome the above-mentioned technical defects is a problem that urgently needs to be solved by those skilled in the art. Summary of the Invention

[0005] The purpose of this invention is to provide an apparatus for rolling Invar alloy ultrathin strips using a double-sided electrically assisted 20-roll mill, in order to solve the problems existing in the prior art.

[0006] To achieve the above objectives, the present invention provides an apparatus for rolling Invar alloy ultrathin strip using a double-sided electrically assisted 20-roll mill, comprising: The rolling mill has a left reel on the left and a right reel on the right. The strip is drawn out from the left reel, rolled by the rolling mill, and then introduced into the right reel. An energized resistance roller is arranged on the left and right sides of the rolling mill and is in contact with the upper or lower surface of the strip. The energized resistance roller is connected to a power source, and the energized resistance roller, the strip, and the power source form an energized heating circuit for the strip. Multiple resistive elements are sequentially arranged along the length of the energized resistance roller. These resistive elements are connected in series and connected to an external control center. The control center is used to control the resistance of the resistive elements. The energized resistance roller is made of conductive material, and the resistive elements are attached to the inner surface of the energized resistance roller.

[0007] Furthermore, it also includes: Two lifting platforms are provided, with hydraulic cylinders at the bottom and insulating rods at the top. The two ends of the energized resistance roller are rotatably mounted on the two insulating rods, and the ends of the energized resistance roller are connected to the drive motor.

[0008] Furthermore, it also includes: A bearing is disposed inside the insulating rod, and the energized resistance roller is connected to the bearing. The ring electrode clamp has the end of the energized resistance roller extending outward from the insulating rod. The resistive element is electrically connected to the ring electrode clamp, and the ring electrode clamp is connected to the drive motor.

[0009] Furthermore, the energized resistance roller includes multiple resistance roller segments connected sequentially along its length, with a vertically aligned mating gap between adjacent resistance roller segments.

[0010] Furthermore, it also includes: A convexity adjustment support rod is provided on the side of the energized resistance roller away from the strip, and the two ends of the convexity adjustment support rod are provided on two insulating rods; Multiple hydraulic pressure caps are set on the convexity adjustment support rod and arranged one-to-one with multiple resistance roller sections; A laser ranging support rod is provided at both ends on two insulating rods. A laser ranging sensor or an image acquisition mechanism is provided on the laser ranging support rod. Both the laser ranging sensor and the image acquisition mechanism are connected to the control center. The laser ranging sensor or the image acquisition mechanism is used to obtain the distance between each resistive roller segment and the strip surface. The control center can control the hydraulic top to drive the resistive roller segment to move closer to or away from the strip surface.

[0011] Furthermore, it also includes: The sensor array, employing contact or non-contact sensors, is arranged adjacent to the energized resistance roller to detect the flatness of the strip before and after passing through the energized resistance roller. The sensor array is communicatively connected to the control center and sends the detected flatness data to the control center.

[0012] Furthermore, an insulating block is provided between the insulating rod and the lifting platform.

[0013] Furthermore, multiple resistive elements are respectively connected to a control bypass, which is electrically connected to the control center; the sensor array includes a temperature sensor for detecting the temperature of the strip before and after passing through the energized resistive roller; the control center controls the heating power of multiple resistive elements through the control bypass based on the temperature detected by the temperature sensor.

[0014] The present invention discloses the following technical effects: 1. Multiple resistance elements are sequentially arranged along the length of the energized resistance roller. These resistance elements are connected in series, and the resistance of each resistance element can be controlled separately by the control center, thereby achieving zoned adjustment of the transverse temperature of the strip.

[0015] 2. The energized resistance roller comprises multiple resistance roller segments connected sequentially along its length. Adjacent resistance roller segments have a vertical fitting gap, which allows the resistance roller segments to move up and down a certain distance. To address the problem that the front and back sides of the strip are easily separated from the energized resistance roller, this invention obtains the distance between the strip surface and the resistance roller segments and then uses hydraulic pressure to tightly connect the resistance roller segments to the strip surface, thus avoiding the problem of unstable current. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a schematic diagram showing the connection between the insulating rod and the energized resistance roller. Figure 3 This is a schematic diagram showing the connection between the hydraulic cylinder and the insulating rod. Figure 4 A schematic diagram showing the interaction between the hydraulic cylinder and the insulating rod when the energized resistance roller is positioned on the lower surface of the strip; Figure 5 This is a schematic diagram of the structure of an energized resistance roller; The components include: 1. Rolling mill; 2. Left roll; 3. Right roll; 4. Electrified resistance roller; 5. Left strip shaper; 6. Right strip shaper; 7. Resistance element; 8. Lifting platform; 9. Hydraulic cylinder; 10. Insulating rod; 11. Bearing; 12. Ring electrode clamp; 13. Convexity adjustment support rod; 14. Hydraulic top; 15. Laser ranging support rod; and 16. Insulating block. Detailed Implementation

[0018] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0019] Those skilled in the art will understand that the term "comprising" as used in this application means the presence of the stated features, integers, steps, operations, elements, and / or components, but does not exclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and / or groups thereof. It should be understood that when we say an element is "connected" or "coupled" to another element, it can be directly connected or coupled to the other element, or there may be intermediate elements present. Furthermore, "connected" or "coupled" as used herein can include wireless connections or wireless coupling. The term "and / or" as used herein includes all or any unit and all combinations of one or more associated listed items.

[0020] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0021] like Figures 1 to 5 As shown, an embodiment of the present invention provides an apparatus for rolling Invar alloy ultrathin strip using a double-sided electrically assisted 20-roll mill, comprising: The rolling mill 1 has a left reel 2 and a left strip shaper 5 on the left side, and a right reel 3 and a right strip shaper 6 on the right side. The strip is drawn out from the left reel 2, rolled by the rolling mill 1, and then introduced into the right reel 3. The strip shaper (including the left strip shaper 5 and the right strip shaper 6) is used to detect the flatness of the strip, which is existing technology and will not be described in detail here. The energized resistance roller 4 is arranged on the left and right sides of the rolling mill 1 and is in contact with the upper or lower surface of the strip. The energized resistance roller 4 is connected to the power supply, and the energized resistance roller 4, the strip and the power supply form an energized heating circuit for the strip. Multiple resistor elements 7 are sequentially arranged along the length of the energized resistance roller 4. The multiple resistor elements 7 are connected in series and connected to an external control center. The control center is used to control the resistance of the resistor elements 7. The energized resistance roller 4 is made of conductive material, and the resistor elements 7 are attached to the inner surface of the energized resistance roller 4.

[0022] In this embodiment, since the properties of the front and back sides of the strip are different, the energized resistance roller 4 can be specifically arranged on the upper or lower surface of the strip according to the actual situation (e.g., Figure 4 (As shown). In some other embodiments, two sets of energized resistance rollers 4 and the following structures can also be arranged symmetrically vertically.

[0023] In this embodiment, it also includes: Two lifting platforms 8 are provided with hydraulic cylinders 9 at the bottom and insulating rods 10 at the top. The two ends of the energized resistance roller 4 are rotatably mounted on the two insulating rods 10, and the ends of the energized resistance roller 4 are connected to the drive motor.

[0024] In this embodiment, it also includes: The bearing 11 is installed inside the insulating rod 10, and the energized resistance roller 4 is connected to the bearing 11. The annular electrode clamp 12 has an end of the energized resistance roller 4 extending outward from the insulating rod 10. The resistive element 7 is electrically connected to the annular electrode clamp 12, and the annular electrode clamp 12 is connected to the drive motor.

[0025] The annular electrode clamp 12 is made of stainless steel in a cylindrical shape to ensure the uniform distribution of current and realize the function of energizing the energized resistance roller 4.

[0026] In this embodiment, the energized resistance roller 4 includes a plurality of resistance roller segments connected sequentially along the length direction, and adjacent resistance roller segments have a mating gap along the vertical direction.

[0027] In this embodiment, it also includes: The convexity adjustment support rod 13 is located on the side of the energized resistance roller 4 away from the strip, and the two ends of the convexity adjustment support rod 13 are located on two insulating rods 10. Multiple hydraulic pressure tops 14 are set on the convexity adjustment support rod 13 and arranged in a corresponding manner to multiple resistance roller segments; A laser ranging support rod 15 is mounted on two insulating rods 10 at both ends. A laser ranging sensor or an image acquisition mechanism is mounted on the laser ranging support rod 15. Both the laser ranging sensor and the image acquisition mechanism are connected to the control center. The laser ranging sensor or the image acquisition mechanism is used to obtain the distance between each resistive roller segment and the surface of the strip. The control center can control the hydraulic top 14 to drive the resistive roller segment to move closer to or away from the surface of the strip.

[0028] In this embodiment, an insulating block 16 is provided between the insulating rod 10 and the lifting platform 8.

[0029] In this embodiment, multiple resistive elements 7 are respectively connected to the control bypass, and the control bypass is electrically connected to the control center; the sensor array includes a temperature sensor for detecting the temperature of the strip before and after passing through the energized resistive roller 4. Based on the temperature detected by the temperature sensor, the control center controls the heating power of the multiple resistive elements 7 through the control bypass.

[0030] In this embodiment, the basic principle of the control center controlling the heating power of multiple resistive elements 7 is as follows: the temperature distribution curve of the energized resistive roller 4 is preset, the temperature is detected by the temperature sensor, and the preset temperature is compared with the detected temperature by the control center. The specific algorithm can use existing technology, which will not be elaborated here. Finally, the heating power of multiple resistive elements 7 is adjusted by the control bypass.

[0031] In other embodiments, solid-state relays, contactors, and other components may be arranged to facilitate the rapid switching of current through a resistor element 7.

[0032] In this embodiment, the energized resistance roller 4 includes 5 resistance roller segments, and the hydraulic top 14 is also correspondingly set with 5 segments, dividing the strip into 5 regions along the transverse direction. The specific algorithm for adjusting the spacing based on the laser rangefinder sensor is as follows: Strip shape deviation calculation ei(t)=ym,i(t)-yt,i(t); yt, i(t) = 0; ei(t) = ym, i(t); Basic control law (PID); ; Laser ranging safety constraints Δd = dmean – dset; Uisafe = Kd·Δd; Final control quantity synthesis .

[0033] In this embodiment, it also includes: The sensor array, employing contact or non-contact sensors, is arranged adjacent to the energized resistance roller 4. It is used to detect the flatness of the strip before and after passing through the energized resistance roller 4. The sensor array is connected to the control center and sends the detected flatness data to the control center.

[0034] By detecting changes in flatness, the output distance of the hydraulic top 14 can be corrected, thereby ensuring close contact between the energized resistance roller 4 and the strip surface, improving the quality of energized heating. The specific algorithm is as follows: Strip flatness index Overall strip shape standard deviation (for assessing flatness): ; Maximum strip shape deviation: emax(t) = max│ym,i(t)│ Control effect evaluation Strip shape improvement rate (compared to the previous control period): ; Contact distance uniformity Δd(t)=maxd i (t)−mind i (t).

[0035] In the above formula: Suppose that the strip width direction is divided into N=5 regions, with subscripts i=1,2,…,5.

[0036] y t，i (t): Target strip shape value for the i-th region (0 when flat); e i (t) = y m，i (t)-y t，i (t): Strip shape deviation (positive or negative); u i (t) = Control output of hydraulic cylinder 9 in zone i (adjustment amount, which can be displacement or pressure setpoint); d i (t): The contact distance of the i-th zone measured by laser ranging (or the distance indirectly reflected by the roll gap); dmean: The actual distance between the laser ranging energized resistance roller 4 and the strip; Dset: The preset distance between the laser ranging energized resistance roller 4 and the strip; Δuisafe: Safety constraints for laser ranging; K p K i K d PID control parameters (can be partitioned independently); G: Strip shape influence matrix (strip shape - hydraulic top 14 adjustment coupling matrix).

[0037] In this embodiment, the control algorithm unit calculates the target pressing amount and energizing sequence for five regions (corresponding to five levels of hydraulic tops 14) in the strip width direction from the preset strip shape target curve (straight) and real-time strip shape meter data. These parameters can be manually input through the host computer's "segmented energizing control window" or automatically generated by the system. The five levels of hydraulic tops 14 are adjusted sequentially (or in parallel groups): Segment 1: Start the corresponding hydraulic top 14, pressing down to the calculated value → Laser rangefinder confirms good contact between the resistance roller segment and the strip → Energize the resistance roller segment → Strip shape meter + sensor array measures the flatness of the strip segment → Record the data. Segments 2-5: Repeat the above steps sequentially, or in a "parallel grouping" mode (e.g., energize segments 1+3 simultaneously, and compensate segments 2+4+5 later). After each segment adjustment, the system automatically compares the measured strip shape with the target curve. If the deviation exceeds the threshold, it automatically fine-tunes the top parameters for the next segment or prompts for manual intervention.

[0038] If the flatness of a section of the strip is not up to standard, the system immediately adjusts the hydraulic pressure top 14 of the corresponding section to ensure closer contact between the strip and the resistance roller, thus guaranteeing the accuracy of the energization measurement. After all five sections are adjusted, the system generates a segmented energization report, including the pressing amount, energization duration, flatness data, and contact status for each section. The data is automatically archived to the production batch file for easy quality traceability.

[0039] The strip shape meter provides global flatness data, while the sensor array provides local contact area data. The combination of the two enables high-precision adjustment.

[0040] Segmented independent control: The 5-level hydraulic top clamp 14 can be adjusted independently or linked together to adapt to different strip and plate shapes.

[0041] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0042] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0043] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0044] The embodiments described above are merely preferred embodiments of the present invention and are not intended to limit the scope of the present invention. Various modifications and improvements made by those skilled in the art to the technical solutions of the present invention without departing from the spirit of the present invention should fall within the protection scope defined by the claims of the present invention.

Claims

1. A device for rolling Invar alloy ultrathin strips using a double-sided electrically assisted 20-roll mill, characterized in that, include: The rolling mill (1) has a left reel (2) on the left and a right reel (3) on the right. The strip is drawn out from the left reel (2), rolled by the rolling mill (1), and then introduced into the right reel (3). An energized resistance roller (4) is arranged on the left and right sides of the rolling mill (1) and is in contact with the upper or lower surface of the strip. The energized resistance roller (4) is connected to a power source. The energized resistance roller (4), the strip and the power source form an energized heating circuit for the strip. Multiple resistor elements (7) are sequentially arranged along the length of the energized resistance roller (4). The multiple resistor elements (7) are connected in series and connected to an external control center. The control center is used to control the resistance of the resistor elements (7). The energized resistance roller (4) is made of conductive material. The resistor elements (7) are attached to the inner surface of the energized resistance roller (4).

2. The apparatus for rolling Invar alloy ultrathin strip using a double-sided electrically assisted twenty-roll mill according to claim 1, characterized in that, Also includes: Two lifting platforms (8) are provided with hydraulic cylinders (9) at the bottom and insulating rods (10) at the top. The two ends of the energized resistance roller (4) are rotatably mounted on the two insulating rods (10). The ends of the energized resistance roller (4) are connected to the drive motor.

3. The apparatus for rolling Invar alloy ultrathin strip using a double-sided electrically assisted twenty-roll mill according to claim 2, characterized in that, Also includes: The bearing (11) is disposed inside the insulating rod (10), and the energized resistance roller (4) is connected to the bearing (11). The annular electrode clamp (12) has the end of the energized resistance roller (4) extending outward from the insulating rod (10), the resistance element (7) being electrically connected to the annular electrode clamp (12), and the annular electrode clamp (12) being connected to the drive motor.

4. The apparatus for rolling Invar alloy ultrathin strip using a double-sided electrically assisted twenty-roll mill according to claim 2, characterized in that, The energized resistance roller (4) includes multiple resistance roller segments connected sequentially along the length direction, with a vertical clearance between adjacent resistance roller segments.

5. The apparatus for rolling Invar alloy ultrathin strip using a double-sided electrically assisted twenty-roll mill according to claim 4, characterized in that, Also includes: A convexity adjustment support rod (13) is set on the side of the energized resistance roller (4) away from the strip, and the two ends of the convexity adjustment support rod (13) are set on two insulating rods (10); Multiple hydraulic pressure caps (14) are set on the convexity adjustment support rod (13) and arranged one by one with multiple resistance roller segments; A laser ranging support rod (15) is provided at both ends on two insulating rods (10). A laser ranging sensor or an image acquisition mechanism is provided on the laser ranging support rod (15). Both the laser ranging sensor and the image acquisition mechanism are connected to the control center. The laser ranging sensor or the image acquisition mechanism is used to obtain the distance between each resistance roller segment and the surface of the strip. The control center can control the hydraulic top (14) to drive the resistance roller segment to move closer to or away from the surface of the strip.

6. The apparatus for rolling Invar alloy ultrathin strip using a double-sided electrically assisted twenty-roll mill according to claim 5, characterized in that, Also includes: The sensor array, which employs contact or non-contact sensors, is arranged adjacent to the energized resistance roller (4) to detect the flatness of the strip before and after passing through the energized resistance roller (4). The sensor array is connected to the control center and sends the detected flatness data to the control center.

7. The apparatus for rolling Invar alloy ultrathin strip using a double-sided electrically assisted twenty-roll mill according to claim 2, characterized in that, An insulating block (16) is provided between the insulating rod (10) and the lifting platform (8).

8. The apparatus for rolling Invar alloy ultrathin strip using a double-sided electrically assisted twenty-roll mill according to claim 6, characterized in that, Multiple resistive elements (7) are connected to a control bypass, which is electrically connected to the control center. The sensor array includes a temperature sensor for detecting the temperature of the strip before and after passing through the energized resistive roller (4). The control center controls the heating power of multiple resistive elements (7) through the control bypass based on the temperature detected by the temperature sensor.

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