Ultralow-stress aluminum foil slitting process
By combining the analysis of slitting machine operation data and temperature data, early warning signals are generated and voltage adjustments are made, the problem of heat-affected zones in ultra-low stress aluminum foil slitting is solved, high-precision slitting control is achieved, and slitting quality and yield rate are improved.
Patent Information
- Application Number
- CN202510736007.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-06-04
- Publication Date
- 2025-08-26
- Estimated Expiration
- Not applicable · inactive patent
AI Technical Summary
The traditional aluminum foil slitting process produces local high temperatures due to dynamic friction during ultra-low stress aluminum foil processing, resulting in the formation of heat-affected zones, affecting the slitting quality and yield rate. The existing monitoring and control methods lack electrical-thermal coupling analysis, and the response is hysteresis and the heat-affected zones cannot be accurately suppressed.
By monitoring the combined analysis of the operating data of the slitter machine and the temperature data, the operating abnormality time and amplitude proportion and the degree of temperature impact are obtained, the warning signal is generated and the voltage change curve is adjusted to achieve the temperature control of the slitter machine.
Effectively reduce the heat-affected zone during the slitting process of ultra-low stress aluminum foil, ensure the quality and stability of slitting, and improve the yield of slitting.
Smart Images
Figure CN120533765A_ABST
Abstract
Description
Technical Field
[0001] The invention belongs to the technical field of aluminum foil production, and in particular relates to an ultra-low stress aluminum foil slitting process. Background Art
[0002] Aluminum foil slitting is a key process step in aluminum foil processing, and its quality directly affects subsequent deep processing and the performance of end products. With the widespread application of ultra-low stress aluminum foil in high-precision electronic components, new energy batteries, and other fields, higher requirements are being placed on the accuracy and stability of the slitting process. Traditional aluminum foil slitting processes achieve high-speed slitting by controlling the tension and roller pressure of the slitting machine. However, in the processing of ultra-low stress aluminum foil, due to the inherent stress characteristics of the material, dynamic friction can easily generate localized high temperatures during the slitting process, leading to the formation of a heat-affected zone (HAZ). This in turn causes microstructural changes and increased edge burrs, seriously restricting slitting quality and yield.
[0003] Existing technologies often focus on single-dimensional control of mechanical parameters (such as tension and rotational speed). For example, equipment anomalies are detected by monitoring voltage fluctuations during slitting, or temperature sensors are used to locally control the temperature of the slitting area. However, these methods have significant drawbacks: First, there is a lack of correlation analysis between voltage anomaly monitoring and temperature changes, making it difficult to reveal the inherent laws of the electrothermal coupling effect during the slitting process, resulting in a delayed response to abnormal operating conditions. Second, traditional temperature control strategies often rely on passive cooling, failing to address the heat source generation mechanism and failing to accurately suppress the formation of the heat-affected zone. Summary of the Invention
[0004] In order to make up for the deficiencies of the prior art, at least one technical problem raised in the background technology is solved.
[0005] The technical solution adopted by the present invention to solve its technical problem is: An ultra-low stress aluminum foil slitting process involves inserting rolled aluminum foil onto a feed reel and conveying it to the slitting machine at high speed under tension and roller pressure control. The foil abuts against the underside of a circular cutter, which drives the cutter clockwise. The cutter's speed is synchronized with the slitting speed, controlled at 180 to 300 m / min, allowing the foil to be cut. The slitting process is monitored. Monitor the operating data of the slitting machine, process the operating data, obtain the operating abnormality time ratio and the operating abnormality amplitude ratio, calculate and process the operating abnormality time ratio and the operating abnormality amplitude ratio to obtain the operating performance value; Based on the generated warning signal, the temperature data of the slitting machine is obtained. Based on the combined analysis of the temperature data and the operating data, the proportion of the number of curves in the same direction and the variance of the slope in the same direction are obtained. The proportion of the number of curves in the same direction and the variance of the slope in the same direction are processed to obtain the temperature impact value; Based on the generated high temperature signal, an adjustment voltage is obtained, and the voltage change curve is adjusted to obtain a voltage adjustment curve.
[0006] As a further technical solution of the present invention: the method for obtaining the operating performance value is: The abnormal time ratio and the abnormal amplitude ratio are weighted to obtain the operation performance value.
[0007] As a further technical solution of the present invention: the abnormal time ratio is obtained as follows: Mark the portion of the operating voltage change curve that is above the safety line as an overvoltage curve, obtain the period corresponding to the overvoltage curve on the X-axis, and mark it as a voltage abnormality period; The ratio of the time length corresponding to the voltage abnormality period to the time length corresponding to the detection cycle is calculated to obtain the abnormal time ratio.
[0008] As a further technical solution of the present invention: the abnormal amplitude ratio is obtained as follows: Obtain all operating voltages during the voltage abnormality period, sum and average them to obtain the operating voltage average, perform difference processing on the operating voltage average and the operating voltage safety threshold to obtain the operating voltage over-limit value, perform ratio processing on the operating voltage over-limit value and the operating voltage safety threshold to obtain the abnormal amplitude ratio.
[0009] As a further technical solution of the present invention: if the operating performance value is greater than a threshold, an early warning signal is generated.
[0010] As a further technical solution of the present invention: the method for obtaining the temperature influence degree is: The degree of temperature influence is obtained by calculating the ratio of the number of curves in the same direction to the variance of the slope in the same direction.
[0011] As a further technical solution of the present invention: The ratio of the number of curves in the same direction is obtained as follows: Fitting the detected temperature values to obtain a temperature change curve; Divide the temperature change curve into several temperature sub-curves; Integrate the voltage sub-curve and the temperature sub-curve in the same time period into a sub-curve group; If the slopes of the voltage sub-curve and the temperature sub-curve in the sub-curve group are of the same sign, the sub-curve group is marked as a same-direction sub-curve group; The number of sub-curve groups with the same direction is counted, and the ratio is calculated with the total number of sub-curve groups to obtain the proportion of the number of curves with the same direction.
[0012] As a further technical solution of the present invention: the same direction slope variance is obtained as follows: Calculate the slopes of the voltage sub-curve and the temperature sub-curve in the same-direction sub-curve group by connecting the two end points of the sub-curve with a straight line and measuring the slope of the straight line to obtain the slope of the sub-curve; Calculating the ratio of the slope of the voltage sub-curve to the slope of the temperature sub-curve in the same-direction sub-curve group to obtain a same-direction slope ratio; All the same-direction slope ratios are calculated using the mathematical variance formula to obtain the same-direction slope variance.
[0013] As a further technical solution of the present invention: the method for obtaining the high temperature signal is: If the temperature influence degree is greater than the second threshold, it means that the change in the operating voltage of the slitting machine has a certain influence on the temperature fluctuation of the slices of the slitting machine, and a high temperature degree signal is generated.
[0014] As a further technical solution of the present invention: the voltage adjustment curve is obtained as follows: The slope ratios of all the same-direction sub-curve groups are summed up and averaged to obtain the average slope ratio; Obtain the temperature value at each time point during the normal voltage period, sum and calculate the average value, and process it to obtain the normal temperature; Obtain the temperature value at each time point during the voltage abnormality period, calculate the difference between the temperature and the normal temperature, take the absolute value, and process it to obtain the temperature difference; The temperature difference is multiplied by the average slope ratio to obtain the adjusted voltage corresponding to each time point during the voltage abnormality period; The voltage variation curve is adjusted according to the adjustment voltage corresponding to each time point during the voltage abnormality period to obtain a voltage adjustment curve.
[0015] The beneficial effects of the present invention are as follows: The present invention is to slit ultra-low stress aluminum foil, which is affected by the ultra-low stress of the aluminum foil, so that during the aluminum foil slitting process, the voltage increases, resulting in an increase in the cutting speed, which will increase the heat generated by friction, causing the local temperature of the material to rise, and further may change the microstructure of the material, forming a so-called heat-affected zone; based on this, the mutual influence degree and influence ratio between voltage and temperature in the slitting process are analyzed, and based on this, the operating voltage of the slitting machine is controlled to achieve temperature control of the slitting machine, effectively reducing the generation of heat-affected zone of ultra-low stress aluminum foil during the slitting process, thereby ensuring the slitting quality of ultra-low stress aluminum foil. BRIEF DESCRIPTION OF THE DRAWINGS
[0016] The present invention will be further described below with reference to the accompanying drawings.
[0017] Figure 1 The present invention is a flow chart of an ultra-low stress aluminum foil slitting process. DETAILED DESCRIPTION
[0018] In order to make the technical means, creative features, objectives and effects achieved by the present invention easier to understand, the present invention is further described below in conjunction with specific implementation methods.
[0019] like Figure 1 An ultra-low stress aluminum foil slitting process according to an embodiment of the present invention includes the following steps: Slitting: The rolled aluminum foil is inserted into the unwinding reel and conveyed to the slitting machine at high speed under the control of tension and roller pressure, and abuts against the bottom of the disc knife. The aluminum foil drives the disc knife to rotate clockwise under the action of high-speed operation. The disc knife speed is synchronized with the slitting speed, and the speed is controlled at 180-300m / min, thereby achieving the cutting of the aluminum foil; During the slitting process of S3, the slitting process is monitored to ensure the stability of the slitting process and the stability of the analysis results. The specific slitting monitoring process is as follows: Step 1: Monitor the operating data of the slitting machine, process the operating data, obtain the operating abnormality time ratio and the operating abnormality amplitude ratio, calculate and process the operating abnormality time ratio and the operating abnormality amplitude ratio to obtain the operating performance value; Specifically: During the detection period, the operating voltage of the slitting machine is obtained in real time, and an XY coordinate system is established, wherein the X axis is time and the Y axis is the operating voltage. The detected operating voltage is fitted to obtain an operating voltage change curve; In the coordinate system where the operating voltage change curve is located, the operating voltage safety threshold is used as the first reference value and marked on the Y axis. A straight line parallel to the X axis is drawn through the first reference value and marked as the safety line. It should be noted that the operating voltage safety threshold is the voltage when the slitter cuts low-stress aluminum foil. Increasing the voltage will increase the cutting speed, which will increase the heat generated by friction and cause the local temperature of the material to rise, which may change the microstructure of the material and form the so-called heat-affected zone. This heat-affected zone may affect the performance and appearance of the aluminum foil. Mark the portion of the operating voltage change curve that is above the safety line as an overvoltage curve, obtain the period corresponding to the overvoltage curve on the X-axis, and mark it as a voltage abnormality period; Mark the portion of the operating voltage change curve that is below the safety line as a normal curve, obtain the period corresponding to the normal curve on the X-axis, and mark it as a normal voltage period; The ratio of the time length corresponding to the voltage abnormal period to the time length corresponding to the detection period is calculated to obtain the abnormal time ratio; Obtain all operating voltages during the voltage anomaly period, sum and average them to obtain the operating voltage mean, perform subtraction processing on the operating voltage mean and the operating voltage safety threshold to obtain the operating voltage over-limit value, perform ratio processing on the operating voltage over-limit value and the operating voltage safety threshold to obtain the abnormal amplitude ratio; The weighted calculation of abnormal time ratio and abnormal amplitude ratio is used to obtain the operation performance value, where the weight coefficients of abnormal time ratio and abnormal amplitude ratio are 0.67 and 0.33 respectively; Compare the operating performance value with a first threshold; if the operating performance value is greater than the first threshold, generate a warning signal; if the operating performance value is less than or equal to the first threshold, do nothing; Step 2: Based on the generated warning signal, obtain the temperature data of the slitting machine. Based on the combined analysis of the temperature data and the operating data, obtain the proportion of the number of curves in the same direction and the variance of the slope in the same direction. Process the proportion of the number of curves in the same direction and the variance of the slope in the same direction to obtain the temperature impact value. Specifically, the temperature of the slices on the slitting machine is obtained through a wireless temperature sensor, with the X-axis representing time and the Y-axis representing temperature. The detected temperature values are fitted to obtain a temperature change curve; Divide the temperature change curve into several temperature sub-curves; It should be noted that the curve between two adjacent marked points is a sub-curve; Similarly, the voltage change curve and the temperature change curve are divided into several voltage sub-curves in the same way; Integrate the voltage sub-curve and the temperature sub-curve in the same time period into a sub-curve group; If the slopes of the voltage sub-curve and the temperature sub-curve in the sub-curve group are of the same sign, the sub-curve group is marked as a same-direction sub-curve group; Count the number of same-direction sub-curve groups and calculate the ratio with the total number of sub-curve groups to obtain the proportion of same-direction curves. Calculate the slopes of the voltage sub-curve and the temperature sub-curve in the same-direction sub-curve group by connecting the two end points of the sub-curve with a straight line and measuring the slope of the straight line to obtain the slope of the sub-curve; Calculating the ratio of the slope of the voltage sub-curve to the slope of the temperature sub-curve in the same-direction sub-curve group to obtain a same-direction slope ratio; All the same-direction slope ratios are calculated using the mathematical variance formula to obtain the same-direction slope variance; The temperature influence degree is obtained by calculating the ratio of the number of curves in the same direction to the variance of the slope in the same direction. The temperature influence degree is compared with the second threshold value for analysis. The specific comparison process is as follows: If the temperature influence degree is greater than the second threshold, it means that the change in the operating voltage of the slitting machine has a certain influence on the temperature fluctuation of the slices of the slitting machine, and a high temperature degree signal is generated; If the temperature influence is less than or equal to the second threshold, it means that there is no certain covariance relationship between temperature and voltage, so a low temperature signal is generated; Step 3: Based on the generated high temperature signal, an adjustment voltage is obtained, and the voltage change curve is adjusted to obtain a voltage adjustment curve; Specifically, based on the temperature impact signal, the slope ratios of all the same-direction sub-curve groups are summed and averaged to obtain the average slope ratio; Obtain the temperature value at each time point during the normal voltage period, sum and calculate the average value, and process it to obtain the normal temperature; Obtain the temperature value at each time point during the voltage abnormality period, calculate the difference between the temperature and the normal temperature, take the absolute value, and process it to obtain the temperature difference; The temperature difference is multiplied by the average slope ratio to obtain the adjusted voltage corresponding to each time point during the voltage abnormality period; The voltage variation curve is adjusted according to the adjustment voltage corresponding to each time point during the voltage abnormality period to obtain a voltage adjustment curve; and the operation of the slitting machine is controlled according to the voltage adjustment curve; The technical solution of the embodiment of the present invention: During the slitting process, a slitting process is provided to monitor the slitting process, and the specific monitoring process is as follows: monitoring the operating data of the slitting machine, processing the operating data, obtaining the proportion of abnormal operating time and the proportion of abnormal operating amplitude, calculating and processing the proportion of abnormal operating time and the proportion of abnormal operating amplitude to obtain the operating performance value; based on the generated early warning signal, obtaining the temperature data of the slitting machine, based on the combined analysis of the temperature data and the operating data, obtaining the proportion of the number of curves in the same direction and the variance of the slope in the same direction, processing the proportion of the number of curves in the same direction and the variance of the slope in the same direction to obtain the temperature impact value; based on the generation of a high temperature degree signal, obtaining the adjustment voltage, and adjusting the voltage change The curve is adjusted to obtain a voltage adjustment curve; this embodiment is to slit the ultra-low stress aluminum foil, which is affected by the ultra-low stress of the aluminum foil, so that in the process of slitting the aluminum foil, the voltage increases, resulting in an increase in the cutting speed, which will increase the heat generated by friction, causing the local temperature of the material to rise, and then may change the microstructure of the material to form a so-called heat-affected zone; based on this, the degree of mutual influence and influence ratio between voltage and temperature in the slitting process are analyzed, and based on this, the operating voltage of the slitting machine is controlled to achieve temperature control of the slitting machine, effectively reducing the generation of heat-affected zone of ultra-low stress aluminum foil in the slitting process, thereby ensuring the slitting quality of ultra-low stress aluminum foil.
[0020] The basic principles, main features, and advantages of the present invention are shown and described above. Those skilled in the art should understand that the present invention is not limited to the foregoing embodiments. The foregoing embodiments and descriptions are merely illustrative of the principles of the present invention. Various changes and modifications may be made to the present invention without departing from the spirit and scope of the present invention. Such changes and modifications are intended to fall within the scope of the present invention. The scope of protection claimed in the present invention is defined by the appended claims and their equivalents.
Claims
1. An ultra-low stress aluminum foil slitting process, wherein rolled aluminum foil is inserted onto a feed reel and conveyed to a slitting machine at high speed under tension and roller pressure control, where it abuts against a disc cutter. The high-speed operation of the aluminum foil drives the disc cutter to rotate clockwise. The disc cutter speed is synchronized with the slitting speed and is controlled at 180-300 m / min, thereby achieving aluminum foil slitting. The process is characterized by: Monitoring of the slitting process: Monitor the operating data of the slitting machine, process the operating data, obtain the operating abnormality time ratio and the operating abnormality amplitude ratio, calculate and process the operating abnormality time ratio and the operating abnormality amplitude ratio to obtain the operating performance value; Based on the generated warning signal, the temperature data of the slitting machine is obtained. Based on the combined analysis of the temperature data and the operating data, the proportion of the number of curves in the same direction and the variance of the slope in the same direction are obtained. The proportion of the number of curves in the same direction and the variance of the slope in the same direction are processed to obtain the temperature impact value; Based on the generated high temperature signal, an adjustment voltage is obtained, and the voltage change curve is adjusted to obtain a voltage adjustment curve.
2. The ultra-low stress aluminum foil slitting process according to claim 1, characterized in that: The method for obtaining the operation performance value is as follows: The abnormal time ratio and the abnormal amplitude ratio are weighted to obtain the operation performance value.
3. The ultra-low stress aluminum foil slitting process according to claim 2, characterized in that: The method for obtaining the abnormal time ratio is as follows: Mark the portion of the operating voltage change curve that is above the safety line as an overvoltage curve, obtain the period corresponding to the overvoltage curve on the X-axis, and mark it as a voltage abnormality period; The ratio of the time length corresponding to the voltage abnormality period to the time length corresponding to the detection cycle is calculated to obtain the abnormal time ratio.
4. The ultra-low stress aluminum foil slitting process according to claim 2, characterized in that: The method for obtaining the abnormal amplitude ratio is as follows: Obtain all operating voltages during the voltage abnormality period, sum and average them to obtain the operating voltage average, perform difference processing on the operating voltage average and the operating voltage safety threshold to obtain the operating voltage over-limit value, perform ratio processing on the operating voltage over-limit value and the operating voltage safety threshold to obtain the abnormal amplitude ratio.
5. The ultra-low stress aluminum foil slitting process according to claim 1, characterized in that: If the operating performance value is greater than the threshold, an early warning signal is generated.
6. The ultra-low stress aluminum foil slitting process according to claim 1, characterized in that: The degree of temperature influence is obtained as follows: The degree of temperature influence is obtained by calculating the ratio of the number of curves in the same direction to the variance of the slope in the same direction.
7. The ultra-low stress aluminum foil slitting process according to claim 6, characterized in that: The ratio of the number of curves in the same direction is obtained as follows: Fitting the detected temperature values to obtain a temperature change curve; Divide the temperature change curve into several temperature sub-curves; Integrate the voltage sub-curve and the temperature sub-curve in the same time period into a sub-curve group; If the slopes of the voltage sub-curve and the temperature sub-curve in the sub-curve group are of the same sign, the sub-curve group is marked as a same-direction sub-curve group; The number of sub-curve groups with the same direction is counted, and the ratio is calculated with the total number of sub-curve groups to obtain the proportion of the number of curves with the same direction.
8. The ultra-low stress aluminum foil slitting process according to claim 6, characterized in that: The same direction slope variance is obtained as follows: Calculate the slopes of the voltage sub-curve and the temperature sub-curve in the same-direction sub-curve group by connecting the two end points of the sub-curve with a straight line and measuring the slope of the straight line to obtain the slope of the sub-curve; Calculating the ratio of the slope of the voltage sub-curve to the slope of the temperature sub-curve in the same-direction sub-curve group to obtain a same-direction slope ratio; All the same-direction slope ratios are calculated using the mathematical variance formula to obtain the same-direction slope variance.
9. The ultra-low stress aluminum foil slitting process according to claim 1, characterized in that: The method for obtaining the high temperature signal is: If the temperature influence degree is greater than the second threshold, it means that the change in the operating voltage of the slitting machine has a certain influence on the temperature fluctuation of the slices of the slitting machine, and a high temperature degree signal is generated.
10. The ultra-low stress aluminum foil slitting process according to claim 1, characterized in that: The voltage adjustment curve is obtained as follows: The slope ratios of all the same-direction sub-curve groups are summed up and averaged to obtain the average slope ratio; Obtain the temperature value at each time point during the normal voltage period, sum and calculate the average value, and process it to obtain the normal temperature; Obtain the temperature value at each time point during the voltage abnormality period, calculate the difference between the temperature and the normal temperature, take the absolute value, and process it to obtain the temperature difference; The temperature difference is multiplied by the average slope ratio to obtain the adjusted voltage corresponding to each time point during the voltage abnormality period; The voltage variation curve is adjusted according to the adjustment voltage corresponding to each time point during the voltage abnormality period to obtain a voltage adjustment curve.