Disclosed is a control process for grading and digging edges of a welding crescent shear adapted to automatic feed of a disc shear

Abstract

The application discloses a kind of welding crescent shear grading edge control processes suitable for automatic feed of disc shear, and relates to cold-rolled strip continuous production line technology.Displacement reference is established by center calibration punching of weld, and weld and crescent notch are tracked by steering roller incremental encoder.Crescent notch is set at weld, front coil side or rear coil side according to width difference and width relation of front and rear coils, notch depth is determined with minimum feed, single edge cutting allowance and safety allowance, and equipment allowable range is verified.Three kinds of slotting positions are matched with stop, width adjustment, knife gap adjustment, automatic feed and synchronous start timing, and notch quality is detected before disc shear cutting.The process makes notch position, size and disc shear action cooperate with each other, and reduces shear interference risk of width transition area.

Description

Technical Field

[0001] This invention relates to the technical field of continuous production lines for cold-rolled strip steel, specifically to a graded edge-cutting control process for a crescent-shaped shear for weld seams that is adapted to the automatic feed of a disc shear. Background Technology

[0002] In continuous cold-rolled strip production lines, the beginning and end of the strip from the preceding and following coils are typically welded together, allowing the strip to continuously pass through pickling, annealing, hot-dip galvanizing, or finishing stations. The weld area exhibits localized shape variations, and when the widths of the preceding and following coils differ, a transitional zone between wide and narrow sections is formed. When this area enters the disc shear, the shear blade may be impacted, easily causing tearing, warping, or burrs on the strip edges. Spatial interference may also occur between the strip edges and the shear blade, cutter shaft, and shear housing.

[0003] To allow space for the disc shear's feed, a crescent-shaped notch can be machined using a crescent shear at the preceding station. However, relying solely on long-term cumulative displacement to determine the weld position without a reference calibration for this weld can easily cause existing positional errors to carry over to subsequent welds. Furthermore, relying solely on experience to select the notch position and size makes it difficult to consider the difference in width between the front and rear rolls, the trimming allowance, and the equipment clearance space.

[0004] Furthermore, the arrival order of the weld and notch differs for grooving at the weld seam, grooving on the front roll side, and grooving on the rear roll side. If the timing of the disc shear's stop, width adjustment, and re-entry is not adjusted according to the grooving position, it may enter the cut at an inappropriate location, affecting the continuous processing of the width-narrow transition area. Therefore, it is necessary to coordinate weld seam calibration, notch size verification, graded grooving, and disc shear linkage control. Summary of the Invention

[0005] The purpose of this invention is to provide a graded edge-cutting control process for a crescent-shaped shear for welds that is compatible with the automatic feed of a disc shear. This process ensures that the weld position calibration, the size and position of the crescent notch, the width adjustment of the disc shear during shutdown, and the feed sequence are matched to each other, thereby reducing the risk of shearing impact and spatial interference in the transition area between the width and narrowness of the weld.

[0006] The technical solution of this invention is: a graded edge-cutting control process for a crescent-shaped shear for weld seams adapted to automatic feed of a disc shear, comprising the following steps: Step 101: Set a calibration punch at the center of the weld, take its center as the zero point of displacement, use the incremental encoder of the steering roller to track the strip displacement, and use the programmable logic controller to obtain the absolute value of the bandwidth difference between the front and rear rolls of strip. Step 102: Using the edge line of the coiled strip as a reference, determine the depth of the crescent notch as the sum of the minimum feed amount of the disc shear, the single-sided cutting allowance, and the safety allowance, and verify the grooving width, the box clearance, and the processing range of the crescent shear blade. Step 103: When the bandwidth difference is less than 200mm and the grooving at the weld meets the verification requirements, symmetrical grooving is performed at the weld; when the bandwidth difference is 200-300mm and the corresponding offset position is verified as qualified, if the back roll is wider, grooving is performed 1000mm away from the weld on the front roll side, and if the back roll is narrower, grooving is performed 1000mm away from the weld on the back roll side. Step 104: Based on the tracking position, control the disc shear and strip in conjunction: When grooving at the weld seam, stop the machine when the notch is in place, adjust the width, and start synchronously; when grooving on the front coil side, stop the machine when the notch is in place, adjust the width, resume synchronous operation, and do not stop the machine when passing through the weld seam; when grooving on the rear coil side, stop shearing when the weld seam is in place, open the shear blade, and the strip will send the notch to the shearing station and stop, adjust the width, and then start synchronously after a second cut; in each mode, after the notch is in place and the machine stops, the width adjustment, blade gap adjustment, and automatic cut are completed, and then the machine starts synchronously.

[0007] Further, in step 101, the weld surface is ground to remove surface inclusions and protrusions, and the diameter of the calibration punch is 8-12mm; when the punching is completed, the count of the incremental encoder is latched, and the count is used as the starting point for the displacement of this weld. The difference between the subsequent count and the latched count is used to calculate the strip displacement.

[0008] Furthermore, the diameter of the calibration punch is 10mm; the incremental encoder of the steering roller is calibrated before tracking, and the fixed coordinates of the disc shearing station are set; the shearing blade gap of the crescent shear is adjusted according to the current strip thickness.

[0009] Furthermore, in step 102, the depth of the crescent-shaped notch satisfies: and satisfy , and ; in, The depth of the crescent-shaped notch is based on the edge line of the future coiled strip. To determine the minimum feed rate of the disc shears to match the minimum slot width, This is the allowance for cutting on one side only. For mechanical and control safety margins. This refers to the maximum allowable notch depth of the disc shear mechanism. This represents the maximum permissible notch depth for the crescent-shaped scissor blades within a dimensional reference. The width of the crescent-shaped notch along the strip's running direction. This is the minimum allowable slot width for the crescent-shaped scissor blade.

[0010] Furthermore, the single-sided cutting allowance It is 10-30mm; exist Under the parameter settings, the depth of the crescent notch The diameter is 130-150mm, where the crescent notch depth is 140mm when the single-sided cutting allowance is 20mm; the width of the crescent notch... The width is 600-650mm, and it meets the minimum slot width requirement.

[0011] Furthermore, in the control mode corresponding to the grooving at the weld, after the disc shear cuts the edge of the front coiled strip to the crescent-shaped notch position, the strip and the disc shear stop running; during the period when the strip stops, the disc shear adjusts the width according to the cutting requirements of the rear coiled strip, adjusts the blade gap, and completes automatic cutting. Then, the disc shear and the strip start synchronously to cut the edge of the rear coiled strip.

[0012] Furthermore, in the control mode corresponding to the front-roll side grooving, the crescent-shaped notch arrives at the disc shearing station before the weld seam, and the strip and disc shear stop running at the crescent-shaped notch position; after the disc shear is widened, the blade gap is adjusted, and automatic feed is performed, the strip resumes running and the disc shear starts synchronously, so that the disc shearing speed is consistent with the strip running speed; when the weld seam passes through the shearing area, the disc shear and the unit do not stop, and switch to the cutting of the rear-rolled strip edge.

[0013] Furthermore, in the control mode corresponding to the back-roll side grooving, the disc shear stops running and opens its blade after cutting the edge of the front-rolled strip to the weld position. The strip continues to run until the crescent-shaped notch on the back-roll side reaches the disc shearing station and stops. The disc shear is widened according to the cutting requirements of the back-rolled strip, the blade gap is adjusted, and the blade is advanced a second time to the position corresponding to the crescent-shaped notch. Then the strip and the disc shear start synchronously.

[0014] Furthermore, the strip running speed is 0 m / min during crescent shearing, and the unit's threading speed does not exceed 50 m / min. Before the disc shearing, the depth, width, center position deviation, and edge quality of the crescent notch are checked. The notch depth is 130-150 mm, the width is 600-650 mm, the absolute value of the center position deviation is not greater than 50 mm, and the edge quality meets the preset edge cutting process requirements. If the inspection fails, the interlock is maintained, and only notches that can be corrected and still meet the notch size and blade processing range requirements after correction are subjected to secondary grooving or re-grinding. Only after the re-inspection is qualified can the strip be released. For excessively large notches or strip tears caused by overcutting, the interlock is maintained, and secondary grooving or re-grinding is not used to replace the qualified judgment.

[0015] Furthermore, when the bandwidth difference is greater than 0 and less than 200mm, and the grooving at the weld cannot simultaneously meet the requirements for depth, width, and blade processing range, the programmable logic controller (PLC) switches to offset grooving according to the width relationship between the rear coil and the front coil: when the rear coil is wider, it switches to grooving at a distance of 1000mm from the weld on the side of the front coil and its corresponding control mode; when the rear coil is narrower, it switches to grooving at a distance of 1000mm from the weld on the side of the rear coil and its corresponding control mode. After offsetting, the notch size and blade processing range are re-verified. If the requirements are met, grooving is executed. If the requirements are still not met, the interlock is maintained, and grooving and automatic feed are not executed.

[0016] The beneficial effects of this invention are: 1. By combining the center calibration punch of the weld with the incremental encoder's starting count, an independent displacement tracking benchmark is established for each weld, avoiding the direct use of the cumulative count of previous welds as the starting point of the current weld's position. Combined with encoder calibration, this helps reduce positioning deviations caused by unclear benchmarks. This measure does not eliminate all errors caused by steering roller slippage or improper proportional calibration.

[0017] 2. By classifying the bandwidth difference and the relationship between the width of the front and rear rolls, the slots are selected at the weld, the front roll side, or the rear roll side. This separates the cutting notch from the weld when there is a large bandwidth difference, allowing the disc shear to adjust the width and cut according to the order of arrival of the notch and the weld, reducing the risk of cutting directly at unsuitable abrupt changes in width.

[0018] 3. By summing the notch depth and jointly verifying the minimum width, mechanical clearance depth, and blade processing range, the change in cutting allowance can be reflected in the notch depth. At the same time, notch schemes that exceed the allowable range of the equipment are eliminated, providing a spatial basis for the shear blade to enter the target cutting position.

[0019] 4. By defining the stop position, whether the strip continues to be fed, and the re-feeding sequence through three control modes, the grooving at the weld seam is started synchronously after the machine is stopped for adjustment, the grooving on the front coil side is started synchronously after the machine resumes operation without stopping the machine through the weld seam, and the grooving on the rear coil side is started by stopping the shear to let the strip pass and then feeding the strip again at the notch. This reduces the situation where the position determination and the equipment action are mismatched.

[0020] 5. By performing crescent-shaped grooving during temporary strip material shutdowns and online verification of the notch size, position, and edge quality before disc shearing, the reprocessing, re-inspection, and non-conforming interlocking of correctable notches are coordinated to prevent unqualified notches from entering subsequent cutting edges and causing shearing obstruction or abnormal shutdowns. By configuring graded judgment, size calculation, and speed linkage programs in the existing programmable logic controller, the need to replace the main hardware of the crescent-shaped and disc shears can be reduced, provided that the original processing capacity of the equipment meets the requirements. Attached Figure Description

[0021] Figure 1 This diagram illustrates the linkage between weld seam calibration, encoder tracking, and the crescent shears and disc shears.

[0022] Figure 2 The diagram shows three different slotting positions. Figure 2 (a) in the image represents the groove at the weld. Figure 2 (b) shows a groove cut on the front roll side when the back roll is wider. Figure 2 (c) in the figure refers to the groove on the back roll side when the back roll is narrow.

[0023] Figure 3 This is a flowchart illustrating the bandwidth difference classification, notch size verification, pre-shear detection, and three control modes for the disc shear.

[0024] Figure 4 A schematic diagram showing the working outline of the crescent-shaped shear blades and the structure of the disc shears, in which... Figure 4 (a) shows the working outline of the crescent blade of the scissors. Figure 4 (b) shows the disc shear structure.

[0025] Reference numerals: 1. Front coil strip; 2. Rear coil strip; 3. Weld seam; 4. Calibration punch; 5. Directional roller; 6. Incremental encoder; 7. Crescent shear; 8. Disc shear; 9. Programmable logic controller; 12. Crescent notch; 13. Crescent shear blade. Detailed Implementation

[0026] The specific embodiments of the present invention are described below with reference to the accompanying drawings. The drawings are used to illustrate the relationships between components, the location of slots, and the control flow, and are not intended to limit the size of the equipment or the proportions of each part; the specific processing parameters are based on the effective processing range of the unit used.

[0027] like Figure 1 As shown, the front coiled strip 1 is the running strip located in front of the weld 3 along the strip running direction and enters the disc shear 8 first. The rear coiled strip 2 is a new strip that connects with the front coiled strip 1 via the weld 3 and subsequently enters the disc shear 8. The front coil side refers to the side of the front coiled strip 1 of the weld 3, and the rear coil side refers to the side of the rear coiled strip 2 of the weld 3. When the notch is located on the front coil side, it arrives at the shearing station before the weld; when it is located on the rear coil side, it arrives at the shearing station after the weld.

[0028] In this manual, the edge line of the rear-coiled strip refers to the edge line of the rear-coiled strip 2 on the corresponding side, serving as the dimensional reference for the notch depth and trimming allowance. Modes A, B, and C represent the three control modes corresponding to grooving at the weld, grooving on the front coil side, and grooving on the rear coil side, respectively. Automatic Position Control (APC) is used to bring the disc shear to the set feed position.

[0029] Example 1 The present invention provides a graded edge trimming control process for a weld seam crescent shear adapted to automatic feed of a disc shear, comprising the following steps: Step 101: Set a calibration punch at the center of the weld, take its center as the zero point of displacement, use the incremental encoder of the steering roller to track the strip displacement, and use the programmable logic controller to obtain the absolute value of the bandwidth difference between the front and rear rolls of strip. Step 102: Using the edge line of the coiled strip as a reference, determine the depth of the crescent notch as the sum of the minimum feed amount of the disc shear, the single-sided cutting allowance, and the safety allowance, and verify the grooving width, the box clearance, and the processing range of the crescent shear blade. Step 103: When the bandwidth difference is less than 200mm and the grooving at the weld meets the verification requirements, symmetrical grooving is performed at the weld; when the bandwidth difference is 200-300mm and the corresponding offset position is verified as qualified, if the back roll is wider, grooving is performed 1000mm away from the weld on the front roll side, and if the back roll is narrower, grooving is performed 1000mm away from the weld on the back roll side. Step 104: Based on the tracking position, control the disc shear and strip in conjunction: When grooving at the weld seam, stop the machine when the notch is in place, adjust the width, and start synchronously; when grooving on the front coil side, stop the machine when the notch is in place, adjust the width, resume synchronous operation, and do not stop the machine when passing through the weld seam; when grooving on the rear coil side, stop the shearing when the weld seam is in place, open the shear blade, and stop after the strip sends the notch to the shearing station, adjust the width, and perform a second cut before starting synchronously; in each mode, after the notch is in place and the machine stops, the width adjustment, blade gap adjustment, and automatic cut are completed, and then the machine starts synchronously.

[0030] like Figure 1 As shown, the front roll strip 1 and the rear roll strip 2 are joined by a weld seam 3, with a calibration punch 4 at the center of the weld seam 3. The guide roller 5 contacts the strip, and the incremental encoder 6 is linked to the guide roller 5. The crescent shear 7 is used to process the crescent notch 12, and the disc shear 8 is used for edge trimming. The programmable logic controller 9 receives the weld seam calibration, the incremental encoder 6 counting, the operating status of the crescent shear 7 and the disc shear 8, and the width signals of the front and rear rolls, and outputs grooving, start / stop, width adjustment, and feed commands. Figure 1 The “strip running direction” indicates that the front roll strip 1 goes first, and the rear roll strip 2 then passes through the shearing station.

[0031] like Figure 4 As shown, Figure 4 The crescent-shaped scissor blade 13 shown in (a) has a working profile for forming a crescent-shaped notch. Figure 4 The disc shears 8 shown in (b) provide edge trimming and width adjustment feed functions. The notch size of the present invention must not exceed the space allowed by the actual blade profile and the disc shear structure.

[0032] Further, in step 101, the weld surface is ground to remove surface inclusions and protrusions, and the diameter of the calibration punch is 8-12mm; when the punching is completed, the count of the incremental encoder is latched, and the count is used as the starting point for the displacement of this weld. The difference between the subsequent count and the latched count is used to calculate the strip displacement.

[0033] The diameter of the calibration punch is 10mm; the incremental encoder of the steering roller is calibrated before tracking, and the fixed coordinates of the disc shearing station are set; the shearing blade gap of the crescent shear is adjusted according to the current strip thickness.

[0034] For welding defects such as incomplete penetration that cannot be eliminated by surface grinding, repairs are first completed according to the corresponding welding process, and weld continuity is confirmed before surface grinding and calibration. The punching completion signal and the latch count of the incremental encoder 6 correspond to the same calibration time, and each new weld establishes its own starting count; during tracking, the travel distance is calculated according to the calibrated displacement conversion relationship.

[0035] During debugging, the feed position, allowable width adjustment range, and blade processing range should be calibrated based on the existing process parameters of the disc shear 8 and crescent shear 7. The minimum feed amount of the disc shear must be adapted to the space required for its feed and the minimum grooving width.

[0036] Furthermore, the programmable logic controller 9 collects the actual bandwidths of the front roll of tape 1 and the rear roll of tape 2, and calculates the non-negative bandwidth difference according to equation (1): (1) In equation (1), This represents the absolute value of the bandwidth difference between the front and rear rolls of strip. This is the actual bandwidth of the front roll strip 1. The actual width of the subsequent roll strip 2 is given; all three measurements are in millimeters. Further comparison will follow. and The size determines whether the roll is wider, narrower, or the same width; the direction of transition is not determined by the sign of the absolute value.

[0037] The depth of the crescent-shaped notch 12 is calculated according to formula (2) and verified according to formula (3): (2) (3) In equations (2) and (3), The depth of the crescent-shaped notch 12 is determined along the transverse direction of the strip, with the edge line of the subsequent coil as the reference. Minimum feed rate of the disc shear to match the minimum slot width; This is the allowance for cutting on one side; For mechanical and control safety margins, it is used to reserve space for mechanical clearance, strip lateral fluctuation and control errors; This refers to the maximum allowable notch depth of the disc shear mechanism. The maximum allowable notch depth for the crescent-shaped scissor blade 13 under dimensional references; The width of the crescent-shaped notch 12 along the strip's running direction; The minimum allowable slot width for the crescent-shaped scissor blade 13. and Correspondingly, it is determined by the crescent shape of the crescent-shaped scissors.

[0038] All length parameters mentioned above are measured in millimeters.

[0039] The notch depth, mechanical depth limit, and blade machining range should be checked under the same dimensional reference. For offset grooving on the front roll side, the actual position of the corresponding edge lines of the front and rear roll strips should be considered to check whether the crescent blade 13 can form the target notch profile; it is not acceptable to assume that the equipment can process a value simply because a depth formula is used. The minimum grooving width is related to the blade profile and the space required for the disc shear to feed; the specific limit should be determined by actual equipment calibration and should not be replaced by fixed empirical values ​​that are detached from the equipment.

[0040] Single-sided cutting allowance Select a value of 10–30 mm. Under the following parameter settings, the corresponding notch depth is 130–150 mm: (4) Equation (4) is the parameter setting condition used in this embodiment to illustrate the correspondence between the cutting allowance and the notch depth. It does not mean that all disc shears have the same minimum feed rate or safety margin. When this condition is met, the single-sided cutting allowances are 10mm, 20mm, and 30mm, respectively, and the corresponding notch depths are 130mm, 140mm, and 150mm, respectively. Crescent notch width Even if 600-650mm is selected, the width and processing range constraints of formula (3) must still be met.

[0041] like Figure 2 As shown in (a), when the bandwidth difference is less than 200mm and the groove size at the weld is qualified, the crescent-shaped notch 12 is symmetrically arranged on both sides of the weld 3, and its center along the running direction corresponds to the weld position where the calibration punch 4 is located. Select the first working condition and mode A. When the bandwidth difference is 200-300mm, select the second or third working condition according to the bandwidth of the front and rear rolls.

[0042] like Figure 2 As shown in (b), when the width of the rear coiled strip 2 is greater than that of the front coiled strip 1, the crescent-shaped notch 12 is located on one side of the front coiled strip 1, and its center is 1000mm away from the weld seam 3 along the strip running direction. Select the second working condition and mode B. The crescent-shaped notch 12 reaches the disc shear 8 before the weld seam 3.

[0043] like Figure 2 As shown in (c), when the rear coiled strip 2 is narrower than the front coiled strip 1, the crescent-shaped notch 12 is located on one side of the rear coiled strip 2, with its center 1000mm away from the weld seam 3 along the strip running direction. Three working conditions and mode C are selected. This crescent-shaped notch 12 reaches the disc shear 8 after the weld seam 3. The absolute value of the deviation between the actual position and the target position of the slotting center in each working condition is no greater than 50mm.

[0044] When the bandwidth difference is greater than 0 and less than 200mm, and the grooving at the weld fails the dimensional verification, the corresponding offset grooving position and control mode are changed according to the width or narrowness of the subsequent roll, and the verification is repeated. See Example 5 for details. In cases where the grooving at the weld is of equal width but does not meet the requirements, the bandwidth difference exceeds 300mm, or the dimensional verification still fails after offsetting, the interlock is maintained, and grooving and automatic feed are not executed.

[0045] Using the strip running direction as the positive direction of the fixed coordinate system, and the moment when the calibrated punch 4 completes the reference latching, is taken as the tracking start time. The weld displacement is calculated by converting the count difference of the incremental encoder 6, and its continuous expression is: (5) The tracking coordinates of the center of the crescent-shaped notch 12 are determined according to formula (6): (6) In equations (5) and (6), To calibrate the position of punch 4 in the unit's fixed coordinate system at the calibration time; The time is the time elapsed since the calibration date, in seconds; The time variable is for integration, and the unit is seconds. The linear velocity of the strip at the corresponding moment is expressed in millimeters per second. Real-time coordinates of weld 3; Real-time coordinates of the center of the crescent-shaped gap 12; This is the offset of the notch center relative to the weld. Both coordinates and offsets are in millimeters. (When slotting at the weld...) When slotting the front roll side When slotting the back roll side .

[0046] The programmable logic controller 9 uses the tracking coordinates of the weld seam and notch to perform corresponding position control. The positioning condition after the notch positioning stops is: (7) In equation (7), The fixed coordinates of the disc shear 8 shearing station are defined, and 50mm is the allowable positioning deviation of the notch center. The unit stops the notch at the target station according to the existing positioning and stopping control, and confirms formula (7) after stopping; this formula does not specify the timing of braking only when the notch enters the 50mm range at any linear velocity. The grooving center deviation and the positioning deviation after stopping are checked separately, and the two are not combined into the same test result.

[0047] After the notch is stopped in place, the rotary shear 8 performs width adjustment, blade gap adjustment, and automatic feed in the selected mode. Modes A and B stop and adjust at the crescent-shaped notch position. Mode C first stops shearing at the weld position and opens the shear blade, then feeds the strip to the crescent-shaped notch position on the rear coil side, stops and adjusts, and performs a second feed. After completing the corresponding feed action and meeting the quality release conditions, the strip and rotary shear 8 resume synchronous operation.

[0048] When the crescent shear is used for grooving, the strip running speed is 0 m / min, and the unit's threading speed does not exceed 50 m / min. Before the disc shear is used for cutting, the depth, width, center position deviation, and edge quality of the crescent notch are checked. If the notch depth is 130-150 mm, the width is 600-650 mm, the absolute value of the center position deviation is not greater than 50 mm, and the edge quality meets the preset cutting process requirements, the strip can be released for subsequent cutting. If the inspection fails, the interlock is maintained, and only notches that can be corrected and still meet the notch size and blade processing range requirements after correction are subjected to secondary grooving or re-grinding. The strip can only be released after passing the re-inspection. For excessively large notches or strip tears caused by overcutting, the interlock is maintained, and secondary grooving or re-grinding is not used to replace the acceptance judgment.

[0049] The aforementioned depth detection range of 130-150mm is used to satisfy the parameter settings of equation (4) and is not used as a general equipment limit unrelated to equation (2). The notch depth, width and position deviation are verified by the existing online dimension detection information of the unit, and the edge burrs and strip tearing are checked by the corresponding surface detection information. The edge quality judgment is preset according to the edge cutting process requirements of the processed strip.

[0050] Notch size verification is performed before grooving by the crescent shear 7, and online quality inspection is completed after grooving and before the disc shear 8 performs subsequent edge trimming on the area. Excessively large notches or strip tears caused by overcutting cannot be restored to their original state by further grinding; therefore, such cases are interlocked and not replaced by secondary grinding for acceptance.

[0051] Example 2 This embodiment corresponds to Figure 2 The grooving and pattern A at the weld shown in (a) adopt the calibration, dimensional verification and tracking method of Example 1. The width difference between the front and rear rolls is 150mm, and the rear roll strip 2 is narrower than the front roll strip 1; the single-sided trimming allowance is 20mm, and the diameter of the calibration punch 4 is 10mm.

[0052] Under the parameter settings of formula (4), the depth of the crescent notch 12 is 140mm and the width is selected as 620mm according to formula (2). After verifying that these dimensions meet the mechanical clearance range of the disc shear and the processing range of the crescent shear blade 13, the crescent notch 12 is set at the weld 3, with the center corresponding to the calibration punch 4 and the offset is 0mm.

[0053] In the control mode corresponding to the grooving at the weld, after the disc shear cuts the edge of the front coil strip to the crescent notch position, the strip and the disc shear stop running; during the time the strip stops, the disc shear adjusts the width according to the cutting requirements of the rear coil strip, adjusts the blade gap and completes automatic cutting, and then the disc shear and the strip start synchronously to cut the edge of the rear coil strip.

[0054] The crescent shear 7 completes grooving at a strip running speed of 0 m / min. Before the disc shear cuts, confirm that the notch depth is 140 mm, the width is 620 mm, the absolute value of the center position deviation is no more than 50 mm, and confirm that the edge quality is qualified, then run according to mode A. Figure 2 The front coil strip 1, rear coil strip 2, weld 3, marking punch 4 and crescent notch 12 shown in (a) correspond to the same parts or processing parts in this embodiment.

[0055] Example 3 This embodiment corresponds to Figure 2 The front roll side slotting and pattern B are shown in (b). The width difference between the front and rear rolls is 250mm, the rear roll strip 2 is wider than the front roll strip 1, and the single-sided cutting allowance is 25mm. Under the parameter setting conditions of formula (4), the crescent notch 12 is obtained with a depth of 145mm and a width of 650mm according to formula (2).

[0056] After passing the inspection, a crescent-shaped notch 12 is set on one side of the front coil strip 1, with its center 1000mm away from the weld 3 along the running direction. Taking the strip running direction as the positive direction, the offset of the notch relative to the weld is positive 1000mm. Therefore, the notch reaches the disc shear 8 first, and the weld 3 arrives subsequently. Figure 2 The “strip running direction”, front coil strip 1, rear coil strip 2, weld 3, calibration punch 4 and crescent notch 12 shown in (b) have the same meaning as in Example 1.

[0057] In the control mode corresponding to the front-roll side grooving, the crescent-shaped notch arrives at the disc shearing station before the weld seam. The strip and the disc shear stop running at the crescent-shaped notch position. After the disc shear is widened, the blade gap is adjusted, and automatic feed is performed, the strip resumes running and the disc shear starts synchronously, so that the disc shearing speed is consistent with the strip running speed. When the weld seam passes through the shearing area, the disc shear and the unit do not stop and switch to the cutting of the strip edge after rolling.

[0058] In this embodiment, the crescent-shaped notch 12 stopping at the position of the disc shear 8 is used as the positioning condition for width adjustment, blade gap adjustment, and automatic feed. Automatic feed is completed while the strip stops at the crescent-shaped notch position. After the disc shear 8 is adjusted according to the cutting requirements of the coiled strip 2, the shearing speed is consistent with the strip running speed, and the weld 3 maintains this synchronization when passing through the shearing area.

[0059] Before shearing, a pre-shearing inspection was performed on the crescent-shaped notch 12. After confirming that the depth (145mm), width (650mm), positional deviation, and edge quality all met the set conditions, it was released. The above values ​​are used to illustrate the parameter configuration and control sequence for this operating condition and do not replace the actual geometric range verification of the corresponding unit.

[0060] Example 4 This embodiment corresponds to Figure 2 The back-roll side slotting and pattern C are shown in (c). The width difference between the front and rear rolls is 300mm, the rear roll strip 2 is narrower than the front roll strip 1, the strip thickness is 3mm, and the single-sided cutting allowance is 15mm. Under the parameter setting conditions of formula (4), the depth of the crescent notch 12 is 135mm, and the width is selected as 600mm.

[0061] Adjust the shearing blade gap of the crescent shear 7 according to the strip thickness. After confirming that the dimensions are qualified, process the crescent notch 12 at a position 1000mm away from the weld 3 on one side of the coiled strip 2. The offset of the center of the notch relative to the weld is negative 1000mm. The weld 3 reaches the disc shear 8 before the notch. Figure 2 The front coil strip 1, rear coil strip 2, weld 3, marking punch 4 and crescent notch 12 shown in (c) correspond one-to-one with this embodiment.

[0062] In the control mode corresponding to the back-roll side grooving, the disc shear stops running and opens its blade after cutting the edge of the front-rolled strip to the weld position. The strip continues to run until the crescent-shaped notch on the back-roll side reaches the disc shear cutting station and stops. The disc shear is widened according to the cutting requirements of the back-rolled strip, the blade gap is adjusted, and the blade is fed a second time to the position corresponding to the crescent-shaped notch. Then the strip and the disc shear start synchronously.

[0063] This embodiment separates the control of the disc shear stopping when the weld is in place and the strip stopping when the notch is in place: the former is used to open the shear blade and allow the strip to continue feeding, while the latter is used to perform a second cut at the notch position on the rear coil side. Before shearing, it is confirmed that the notch depth is 135mm, the width is 600mm, the absolute value of the center position deviation is not greater than 50mm, and the edge quality is qualified, and then the continuous cutting of the rear coil strip 2 is resumed.

[0064] Example 5 When the bandwidth difference is greater than 0 and less than 200mm, and the grooving at the weld seam cannot simultaneously meet the requirements for depth, width, and blade processing range, the programmable logic controller (PLC) switches to offset grooving according to the width relationship between the rear coil and the front coil: when the rear coil is wider, it switches to grooving at a distance of 1000mm from the weld seam on the side of the front coil and its corresponding control mode; when the rear coil is narrower, it switches to grooving at a distance of 1000mm from the weld seam on the side of the rear coil and its corresponding control mode. After offsetting, the notch size and blade processing range are re-verified. If the requirements are met, grooving is executed. If the requirements are still not met, the interlock is maintained, and grooving and automatic feed are not executed.

[0065] The above switching does not change the measured bandwidth difference, but instead uses the notch position and disc shear action timing corresponding to the second or third gear. An offset of 1000mm cannot replace dimensional verification, nor can it automatically make a notch exceeding the cutting tool's processing capacity a qualified notch; if the requirements are still not met after the offset, the interlock remains, and unconfirmed automatic feed will not be executed.

[0066] like Figure 3 As shown, after "Signal Activation and Bandwidth Acquisition of Front and Rear Rolls" and "Weld Calibration and Displacement Tracking", "Bandwidth Difference Grading and Notch Size Verification" are performed. "When the first grade is unqualified and not of equal width, use offset grooving" and "Re-verify after offset" are performed according to this embodiment; only if "verification is qualified" will "crescent shear grooving" be performed. If "exceeds the grading range or the final verification is unqualified", the interlock is maintained, and grooving and automatic feed are not performed.

[0067] After grooving, perform "online inspection before disc shearing". "If unqualified, maintain interlock, process and correct again, and determine if it meets the dimensional range". "Yes: re-inspect after secondary grooving or grinding" returns to online inspection; "No" means that uncorrectable defects such as overcutting and tearing will maintain interlock and will not be released; only "qualified" will enter "execute the corresponding control mode after inspection".

[0068] "Mode A: Grooving at the weld" proceeds in sequence: "Stop when notch is in place," "Adjust width and blade gap," "Automatic feed," "Synchronous start of strip and disc shear." "Mode B: Grooving on the front coil side" proceeds in sequence: "Stop when notch is in place," "Adjust width and blade gap," "Automatic feed," "Resume synchronous operation," "Stop without stopping at the weld." "Mode C: Grooving on the rear coil side" proceeds in sequence: "Stop shearing and open shear blade when weld is in place," "Strip continues running until notch is in place," "Stop, adjust width and blade gap," "Secondary feed," "Synchronous start of strip and disc shear." All three modes transition to "Continuous edge cutting of the rear coil strip."

[0069] Figure 3 The displacement tracking in the process is not performed only once at the beginning of the process, but continuously provides the coordinates of weld 3 and crescent notch 12 during strip movement. Mode selection determines the control branch, dynamic coordinates determine the stop, stop, and feed positions within the branch, and detection results determine whether subsequent edge trimming is allowed.

[0070] Given that the existing crescent shear 7, disc shear 8, steering roller 5, and incremental encoder 6 can meet the selected parameters, this process can be implemented by configuring bandwidth difference classification judgment, notch size calculation, position comparison, three-mode timing, speed linkage, and quality interlocking programs in the programmable logic controller 9. This eliminates the need to replace the main hardware of the crescent shear 7 and disc shear 8 simply to achieve the classification control. The process can be applied to continuous production lines for pickling, continuous annealing, hot-dip galvanizing, and finishing cold-rolled strip steel with corresponding weld treatment and edge trimming stations.

Claims

1. A graded edge-cutting control process for a crescent-shaped shear for weld seams, adapted to automatic feed of a disc shear, characterized in that: Includes the following steps: Step 101: Set a calibration punch at the center of the weld, take its center as the zero point of displacement, use the incremental encoder of the steering roller to track the strip displacement, and use the programmable logic controller to obtain the absolute value of the bandwidth difference between the front and rear rolls of strip. Step 102: Using the edge line of the coiled strip as a reference, determine the depth of the crescent notch as the sum of the minimum feed amount of the disc shear, the single-sided cutting allowance, and the safety allowance, and verify the grooving width, the box clearance, and the processing range of the crescent shear blade. Step 103: When the bandwidth difference is less than 200mm and the grooving at the weld meets the verification requirements, symmetrical grooving is performed at the weld; when the bandwidth difference is 200-300mm and the corresponding offset position is verified as qualified, if the back roll is wider, grooving is performed 1000mm away from the weld on the front roll side, and if the back roll is narrower, grooving is performed 1000mm away from the weld on the back roll side. Step 104: Based on the tracking position, control the disc shear and strip in conjunction: When grooving at the weld seam, stop the machine when the notch is in place, adjust the width, and start synchronously; when grooving on the front coil side, stop the machine when the notch is in place, adjust the width, resume synchronous operation, and do not stop the machine when passing through the weld seam; when grooving on the rear coil side, stop the shearing when the weld seam is in place, open the shear blade, and stop after the strip sends the notch to the shearing station, adjust the width, and perform a second cut before starting synchronously; in each mode, after the notch is in place and the machine stops, the width adjustment, blade gap adjustment, and automatic cut are completed, and then the machine starts synchronously.

2. The weld seam crescent shear graded edge trimming control process adapted to automatic feed of disc shears according to claim 1, characterized in that: In step 101, the weld surface is ground to remove surface inclusions and protrusions. The diameter of the calibration punch is 8-12 mm. When the punching is completed, the count of the incremental encoder is latched and used as the displacement starting reference for this weld. The difference between the subsequent count and the latched count is used to calculate the strip displacement.

3. The weld seam crescent shear graded edge trimming control process adapted to automatic feed of disc shears according to claim 2, characterized in that: The diameter of the calibration punch is 10mm; the incremental encoder of the steering roller is calibrated before tracking, and the fixed coordinates of the disc shearing station are set; the shearing blade gap of the crescent shear is adjusted according to the current strip thickness.

4. The weld seam crescent shear graded edge trimming control process adapted to automatic feed of disc shears according to claim 1, characterized in that: In step 102, the depth of the crescent-shaped notch satisfies: and satisfy , and ; in, The depth of the crescent-shaped notch is based on the edge line of the future coiled strip. To determine the minimum feed rate of the disc shears to match the minimum slot width, This is the allowance for cutting on one side only. For mechanical and control safety margins. This refers to the maximum allowable notch depth of the disc shear mechanism. This represents the maximum permissible notch depth for the crescent-shaped scissor blades within a dimensional reference. The width of the crescent-shaped notch along the strip's running direction. This is the minimum allowable slot width for the crescent-shaped scissor blade.

5. The weld seam crescent shear graded edge trimming control process adapted to automatic feed of disc shears according to claim 4, characterized in that: The single-sided cutting allowance It is 10-30mm; exist Under the parameter settings, the depth of the crescent notch The diameter is 130-150mm, where the crescent notch depth is 140mm when the single-sided cutting allowance is 20mm; the width of the crescent notch... The width is 600-650mm, and it meets the minimum slot width requirement.

6. The graded edge-cutting control process for a crescent-shaped weld cutter adapted to automatic feed of a disc shear, as described in claim 1, is characterized in that: In the control mode corresponding to the grooving at the weld, after the disc shear cuts the edge of the front coil strip to the crescent notch position, the strip and the disc shear stop running; during the time the strip stops, the disc shear adjusts the width according to the cutting requirements of the rear coil strip, adjusts the blade gap and completes automatic cutting, and then the disc shear and the strip start synchronously to cut the edge of the rear coil strip.

7. The graded edge-cutting control process for a crescent-shaped shear for weld seams adapted to automatic feed of a disc shear, as described in claim 1, is characterized in that: In the control mode corresponding to the front-roll side grooving, the crescent-shaped notch arrives at the disc shearing station before the weld seam. The strip and the disc shear stop running at the crescent-shaped notch position. After the disc shear is widened, the blade gap is adjusted, and automatic feed is performed, the strip resumes running and the disc shear starts synchronously, so that the disc shearing speed is consistent with the strip running speed. When the weld seam passes through the shearing area, the disc shear and the unit do not stop and switch to the cutting of the strip edge after rolling.

8. The weld seam crescent shear graded edge trimming control process adapted to automatic feed of disc shears according to claim 1, characterized in that: In the control mode corresponding to the back-roll side grooving, the disc shear stops running and opens its blade after cutting the edge of the front-rolled strip to the weld position. The strip continues to run until the crescent-shaped notch on the back-roll side reaches the disc shear cutting station and stops. The disc shear is widened according to the cutting requirements of the back-rolled strip, the blade gap is adjusted, and the blade is fed a second time to the position corresponding to the crescent-shaped notch. Then the strip and the disc shear start synchronously.

9. The weld seam crescent shear graded edge trimming control process adapted to automatic feed of disc shears according to claim 5, characterized in that: When the crescent shear is used for grooving, the strip running speed is 0 m / min, and the unit's threading speed does not exceed 50 m / min. Before the disc shear is used for cutting, the depth, width, center position deviation, and edge quality of the crescent notch are checked. If the notch depth is 130-150 mm, the width is 600-650 mm, the absolute value of the center position deviation is not greater than 50 mm, and the edge quality meets the preset cutting process requirements, the strip can be released for subsequent cutting. If the inspection fails, the interlock is maintained, and only notches that can be corrected and still meet the notch size and blade processing range requirements after correction are subjected to secondary grooving or re-grinding. The strip can only be released after passing the re-inspection. For excessively large notches or strip tears caused by overcutting, the interlock is maintained, and secondary grooving or re-grinding is not used to replace the acceptance judgment.

10. The weld seam crescent shear graded edge trimming control process adapted to automatic feed of disc shears according to claim 4, characterized in that: When the bandwidth difference is greater than 0 and less than 200mm, and the grooving at the weld seam cannot simultaneously meet the requirements of depth, width and blade processing range, the programmable logic controller switches to offset grooving according to the width relationship between the rear roll strip and the front roll strip: when the rear roll is wider, it switches to grooving at a distance of 1000mm from the weld seam on the side of the front roll and its corresponding control mode; when the rear roll is narrower, it switches to grooving at a distance of 1000mm from the weld seam on the side of the rear roll and its corresponding control mode. After offsetting, re-verify the notch size and the cutting range of the blade. If the requirements are met, perform grooving; if they are still not qualified, maintain the interlock and do not perform grooving or automatic feed.

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