A fine wire precision rolling system and method

Abstract

The application discloses a micro-fine wire precision rolling system and method, and the method comprises the following steps: in the rolling process, calculating the apparent cross-sectional area according to the height and width of the wire on the take-up side of the rolling mill measured by a size measuring instrument in real time; matching the apparent cross-sectional area with the expected cross-sectional area; when the area matching fails, adjusting the roll down amount of the rolling mill according to the area matching result to match the apparent cross-sectional area with the expected cross-sectional area; when the area matching is passed, height matching the required height of the wire with the height measured in real time, and when the height matching fails, adjusting the roll down amount of the rolling mill according to the height matching result to match the required height with the height measured in real time. The method is simple, direct, high in precision and low in cost, can realize the measurement of micro-fine size and slight change, can realize online measurement, and has higher stability and production efficiency.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of wire rolling, in particular to a fine wire precision rolling system and method. BACKGROUND

[0002] Rolling is a metal processing technology, which deforms the cross section of the material compressed by the roller by passing the metal blank through the gap of the rotating roller. The size and shape of the material after rolling are affected by the material properties and the rolling process, as well as the equipment friction wear and temperature change fluctuations, and these friction wear and temperature changes are usually difficult to accurately predict, which brings difficulties to the precision rolling control of the material.

[0003] For rolling processes that are processed into rectangular cross sections, it is usually desired that the thickness after rolling reaches the specified size and the shape is flat without waves, warping and other defects, which requires applying horizontal and uniform rolling to the material. In order to achieve such goals, the patent application with publication number CN115090695A discloses a method for continuous control of the tail end deviation of a strip between finishing stands based on machine vision, which relies on a camera unit to detect the strip, uses a sub-pixel edge detection algorithm to obtain the real-time deviation of the strip, then determines whether there is a reverse bending of the strip in the previous stand through a reverse bending identification algorithm, and finally corrects the adjustment value according to different reverse bending conditions and issues it to the finishing mill respectively. The patent application with publication number CN113710386A discloses a method for controlling the serpentine of a rolled material, which corrects the rolling load difference or rolling load difference rate based on any two parameters obtained from the inter-roller thrust, the material-roller inter-roller thrust and the roll shaft direction thrust reaction force when the rolling load is measured, and implements the pressure adjustment leveling control of the rolling mill based on the corrected rolling load difference or rolling load difference rate. The patent application with publication number CN112439793A provides a method for controlling the camber based on the analysis of the center line deviation of the slab, which installs a camber measuring instrument before and after the rolling mill respectively, detects the center line curve of the slab by using the camber measuring instrument, judges the bending direction and degree according to the center line deviation data curve, and calculates the roll gap correction amount. The patent application with publication number CN112139259A provides an automatic deviation correction control method for finishing strip, which calculates the roll gap deviation adjustment amount through the deviation value of the rolling force.

[0004] The above techniques can have certain effects in the rolling of large-sized plates, but in some fields requiring high-quality wire, the subtle changes in the size and shape of the wire cannot be effectively identified by the machine vision method or the shape measuring instrument in the prior art, but these subtle changes will indeed seriously affect the quality of the wire. For example, the hairspring in a mechanical watch is a micro-wire, the cross-sectional shape of which is rectangular, the thickness thereof is usually within the range of 0.025 to 0.035 mm, the width thereof is usually within the range of 0.1 to 0.2 mm, and the thickness tolerance is required to be within 0.5 μm. In addition to the size accuracy requirement, the flat wire used as the hairspring also requires to be straight and free of bending. In addition, the measurement of the rolling force, the inter-roller thrust and other forces cannot effectively detect the subtle changes in the force between the equipment and the material, and these subtle changes in the force also have a significant impact on the size and shape of the hairspring. In the specific field of hairspring rolling, in order to ensure that the size and shape of the flat wire used for the hairspring meet the requirements, the conventional method is to stop the machine for detection every certain period of time. This detection includes the measurement of the size and the manual identification of the straightness of the wire, and then the rolling mill is adjusted according to the detection results, which leads to the inability to realize continuous production. If the size or straightness deviates from the preset value after the stoppage for detection, the left and right rolling mills need to be adjusted separately or simultaneously so that the rolled material is rolled through the parallel rolling mill with the appropriate size of the rolling gap. Since the size of the wire is too small, the cross-sectional shape information of the wire and the rolling gap deviation cannot be directly obtained, and thus the adjustment direction of the rolling gap cannot be known. Therefore, this adjustment is usually blind adjustment, which needs to be tried many times and has extremely low efficiency. SUMMARY

[0005] The technical problem to be solved by the present application is to provide a micro-wire precision rolling system and method to solve the defects of the prior art, such as the inability to realize continuous production and the low efficiency of blind adjustment.

[0006] The technical solution adopted by the present application to solve the technical problem is:

[0007] On the one hand, a micro-wire precision rolling method is constructed, and the method comprises:

[0008] In the rolling process, the apparent cross-sectional area is calculated according to the height and width of the wire on the take-up side of the rolling mill measured in real time by the size measuring instrument;

[0009] The apparent cross-sectional area is area-matched with the expected cross-sectional area, wherein the expected cross-sectional area is calculated according to the shape of the wire on the take-up side of the rolling mill determined in advance and the required height and width;

[0010] When the area matching fails, the rolling mill is adjusted in terms of the rolling mill roll down amount according to the area matching result so that the apparent cross-sectional area is matched with the expected cross-sectional area;

[0011] When the area matching passes, the height of the wire rod required and the size of the height measured in real time is matched in height, and when the height matching fails, the roll down amount of the rolling mill is adjusted according to the height matching result to match the size of the height required and the height measured in real time.

[0012] Further, in the method, the adjustment mode when adjusting the roll down amount of the rolling mill according to the area matching result is only roll down, and each time the roll down is only for one end of the upper roll; the adjustment mode when adjusting the roll down amount of the rolling mill according to the height matching result is roll down or roll up, and each time the roll down or roll up is simultaneously performed for both ends of the upper roll.

[0013] Further, in the method, the adjusting the roll down amount of the rolling mill according to the area matching result specifically comprises:

[0014] selecting one end of the upper roll to roll down by one step, and recalculating the apparent cross-sectional area, if the apparent cross-sectional area decreases, it represents that the selected end is the target end, otherwise, it represents that the other end is the target end;

[0015] gradually rolling down the target end by steps until the apparent cross-sectional area matches the expected cross-sectional area, wherein: after each roll down by one step, the apparent cross-sectional area is recalculated and compared with the expected cross-sectional area, if they are equal, it represents that the apparent cross-sectional area matches the expected cross-sectional area.

[0016] Further, in the method, the adjusting the roll down amount of the rolling mill according to the height matching result specifically comprises:

[0017] gradually adjusting the roll down amount of both ends of the upper roll according to the size relationship between the height size of the wire rod measured in real time and the height size of the wire rod required, until the height size of the wire rod measured in real time and the height size of the wire rod required are equal, wherein, at each adjustment step: if the height size of the wire rod measured in real time is greater than the height size of the wire rod required, the both ends of the upper roll are controlled to roll down by one step; if the height size of the wire rod measured in real time is less than the height size of the wire rod required, the both ends of the upper roll are controlled to roll up by one step.

[0018] Further, in the method, the step length when rolling down is 0.1-0.2δ, the measurement accuracy of the size measuring instrument is not less than 0.2δ, and δ represents the tolerance of the height of the wire rod on the take-up side of the rolling mill.

[0019] Further, in the method, the cross-sectional shape of the wire rod is rectangular, the apparent cross-sectional area is obtained by multiplying the height and the width of the wire rod measured in real time on the take-up side of the rolling mill, and the expected cross-sectional area is obtained by multiplying the height and the width of the wire rod required on the take-up side of the rolling mill determined in advance.

[0020] Further, in the method of the present application, the method further comprises:

[0021] The rolling factor ke, the rolling coefficient kp, the wire material elastic modulus E1 on the pay-off side, the wire material elastic modulus E2 on the take-up side, the pay-off tension f1, the take-up tension f2, the pay-off speed v1, and the take-up speed v2 are predetermined, wherein:

[0022] The height and width of the wire material on the take-up side of the rolling mill are determined in size, and the expected cross-sectional area is calculated.

[0023] The adjusting pressure rods at both ends of the rolling mill are adjusted to make the rolled wire material meet the size requirement of a rectangular cross-section and the shape requirement of straightness.

[0024] In the second aspect, a micro-fine wire precision rolling system is constructed, which comprises a rolling mill, a rolling mill controller, and a size measuring instrument. The size measuring instrument is arranged on the take-up side of the rolling mill for real-time measurement of the height and width of the wire material on the take-up side of the rolling mill and feedback to the rolling mill controller. The rolling mill controller is used to execute the method as described above.

[0025] Further, in the system of the present application, it further comprises a pay-off machine, a pay-off speed tester, a pay-off speed controller, a pay-off tension adjuster, a take-up tension adjuster, a take-up speed tester, a take-up speed controller, and a take-up machine. The pay-off machine, the pay-off speed tester, and the pay-off tension adjuster are sequentially arranged on the pay-off side of the rolling mill. The take-up tension adjuster, the take-up speed tester, and the take-up machine are sequentially arranged on the take-up side of the rolling mill. The pay-off speed controller is connected with the pay-off machine and the pay-off speed tester respectively. The take-up speed controller is connected with the take-up speed tester and the take-up machine respectively. The pay-off speed tester and the take-up speed tester respectively test the pay-off speed and the take-up speed and feedback to the pay-off speed controller and the take-up speed controller for feedback adjustment of the pay-off speed and the take-up speed, so that the pay-off speed and the take-up speed are stably set at the set values. The pay-off tension adjuster and the take-up tension adjuster are used to set the tension values for real-time adjustment of the pay-off tension and the take-up tension respectively.

[0026] Further, in the system of the present application, the size measuring instrument is a laser measuring instrument with size measuring functions in two mutually perpendicular directions or two laser measuring instruments installed vertically. The two laser measuring instruments are installed on a bracket that can move forward and backward, left and right, and rotate, so that the angles of the two directions of the lasers are respectively parallel and perpendicular to a surface of the wire material.

[0027] The left and right ends of the upper roller of the rolling mill are adjusted up and down by the left adjusting pressure rod and the right adjusting pressure rod respectively. The rolling mill controller controls the downward pressure of the upper roller by simultaneously or individually adjusting the left adjusting pressure rod and the right adjusting pressure rod of the rolling mill.

[0028] The micro-fine wire precision rolling system and method of the present application has the following beneficial effects: the present application determines the shape of the wire on the take-up side of the rolling mill and the required height and width dimensions and calculates the expected cross-sectional area, calculates the apparent cross-sectional area during rolling according to the height and width dimensions of the wire on the take-up side of the rolling mill measured in real time by the size measuring instrument, and during rolling, the apparent cross-sectional area is matched with the expected cross-sectional area in priority, and after the area matching passes, the height dimension is further matched. Whether it is area matching or height matching, as long as the matching does not pass, the rolling mill roller down pressure will be adjusted according to the matching result until the matching passes. The present application compares the area and height as the basis for determining the quality of the wire size and shape, and compared with the machine vision, shape detection, and stress testing technologies in the prior art, has the advantages of simple, direct, high precision, and low cost, can realize the measurement of micro-fine size and small changes, and the present application includes measurement, comparison, feedback, and adjustment, can realize online measurement, and compared with the shutdown detection and adjustment scheme in the prior art, has higher stability and production efficiency. BRIEF DESCRIPTION OF DRAWINGS

[0029] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the drawings needed to be used in the embodiments or prior art description will be briefly introduced below. Obviously, the drawings in the following description are only embodiments of the present application, and those skilled in the art can obtain other drawings according to the provided drawings without creative labor:

[0030] Figure 1 is a flowchart of the micro-fine wire precision rolling method of embodiment one of the present application;

[0031] Figure 2 is a schematic diagram of wire rolling;

[0032] Figure 3 is a schematic diagram of the rectangular cross-section of the wire on the take-up side;

[0033] Figure 4 is a schematic diagram of the trapezoidal cross-section of the wire on the take-up side;

[0034] Figure 5 is a structural schematic diagram of the micro-fine wire precision rolling system of embodiment two of the present application;

[0035] Figure 6 is a structural schematic diagram of the rolling mill;

[0036] Figure 7 is a schematic diagram of the measurement, feedback, and adjustment strategy of embodiment two. DETAILED DESCRIPTION

[0037] For the purpose of facilitating the understanding of the present application, a more full and comprehensive description of the present application will be made with reference to the relevant drawings. The drawings show typical embodiments of the present application. However, the present application can be realized in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the disclosure of the present application more thorough and comprehensive. It should be understood that the embodiments of the present application and the specific features in the embodiments are detailed descriptions of the technical solutions of the present application, and are not limitations of the technical solutions of the present application, and the technical features in the embodiments of the present application and the embodiments can be combined with each other without conflict.

[0038] Embodiment one

[0039] Reference Figure 1 , the fine wire precision rolling method of the present embodiment, which can be realized by the system shown in Figure 5 , the system includes a pay-off machine, a pay-off speed tester, a pay-off speed controller, a pay-off tension regulator, a rolling mill, a size measuring instrument, a rolling mill regulator, a take-up tension regulator, a take-up speed tester, a take-up speed controller and a take-up machine. The tension values are set by the pay-off tension regulator and the take-up tension regulator, and the pay-off and take-up tensions are adjusted in real time, respectively. The pay-off speed tester and the take-up speed tester can test the pay-off and take-up speeds, respectively, and are connected to the pay-off machine and the take-up machine through the pay-off speed controller and the take-up speed controller, respectively, and feedback, so as to adjust the rotational speed of the pay-off machine and the take-up machine, so that the pay-off speed and the take-up speed are stabilized at the set values. The size measuring instrument is used to measure the size of the wire width direction and the height (i.e. thickness) direction. The left and right ends of the upper roller can be adjusted up and down by the left and right adjusting pressure rods, respectively. This adjustment can be performed manually or automatically by the rolling mill controller. Preferably, automatic adjustment is realized by the rolling mill controller, which can better realize precise and slight adjustment and is conducive to automation. The rolling mill controller is connected to the size measuring instrument and the rolling mill, calculates and feeds back according to the results provided by the size measuring instrument, so as to realize simultaneous or separate adjustment of the left and right adjusting pressure rods of the rolling mill. The structure of the more system will be described in detail in the embodiment two part later.

[0040] The method of the present embodiment comprises:

[0041] S100: determining the rolling factor ke, the rolling coefficient kp, the pay-off side wire material elastic modulus E1, the take-up side wire material elastic modulus E2, the pay-off tension f1, the take-up tension f2, the pay-off speed v1 and the take-up speed v2 in advance.

[0042] Reference Figure 2 , the wire rolling schematic diagram, the pay-off side cross-sectional area S1 and the take-up side cross-sectional area S2 are functions of the rolling factor ke and the rolling coefficient kp, and there is a relationship as follows:

[0043] S2 = k e *k p S1 (1) ;

[0044] In the present application, ke is set as an empirical factor related to rolling amount and rigidity of the equipment. According to experience, ke is between 0.95-1.05, and for the case of rolling equipment and rolling amount determined, ke can be regarded as a constant value. For the present application, equal cross-section rolling is constructed, i.e.:

[0045] S2 = S1 (2) ;

[0046] That is:

[0047] k e *k p = 1 (3) ;

[0048] According to the experience determined ke value, then according to formula (3) can be calculated:

[0049]

[0050] In the present application, the rolling coefficient k p is a rolling coefficient related to the unwinding speed v1, the winding speed v2, the unwinding tension f1, the winding tension f2, the unwinding side wire material elastic modulus E1, the winding side wire elastic modulus E2, and there is the following relationship:

[0051]

[0052] From formula (5) we can get:

[0053]

[0054] According to the kp value determined by formula (4) and formula (6), the unwinding speed v1, the winding speed v2, the unwinding tension f1, the winding tension f2 are set. The material elastic modulus E1 on the unwinding side and the material elastic modulus E2 on the winding side can be measured by experiment.

[0055] Based on the above analysis, in the present embodiment, according to the rolling experience of the material being iron-nickel alloy, the height being in the range of 0.025-0.050mm, and the width being in the range of 0.090-0.2mm on the rolling mill, ke is between 0.95-1.05, and when the rolling compression amount is about 40-50%, ke is 1. According to formula (4), kp = 1 is calculated. According to material testing, the unwinding side wire material elastic modulus E1 is 155Gpa, and the winding side wire material elastic modulus is 152Gpa, then according to formula (6) we can get Further, the unwinding tension f1 = 0.5N, the winding tension f2 = 0.55N are set, then Further set the unwinding speed v1 as 22 m / min, then the winding speed v2 is 20 m / min.

[0056] S101: Determine the shape of the wire on the winding side of the rolling mill and the required height and width dimensions h 2、 b2, and calculate the expected cross-sectional area, adjust the adjusting pressure rods at both ends of the roller to make the rolled wire meet the size requirements and straight shape requirements of the rectangular cross-section.

[0057] When the material after rolling is expected to be a rectangular cross-section, the cross-sectional area S2 on the winding side has the following relationship with the height h2 and the width b2 of the rectangular cross-section:

[0058] S2=h2*b2 (7);

[0059] The expected cross-sectional area mentioned herein, i.e. the cross-sectional area S2 on the winding side, is obtained by multiplying the pre-determined height h2 and width b2 of the wire on the winding side of the rolling mill.

[0060] After completing the above setting work, the equipment is debugged, the rolled wire is measured by size measurement and manual straightness detection, and the wire is straight without warping and waving, meeting the shape requirements. Then formal rolling is carried out, the size of the wire on the winding side is measured online, the apparent cross-sectional area of the wire on the winding side of the roller is calculated and matched with the adjustment scheme, feedback and adjustment are carried out, so that the size and shape of the wire meet the pre-set values. For details, refer to the following steps S102-S104.

[0061] S102: During rolling, calculate the apparent cross-sectional area St according to the height and width dimensions ht, bt of the wire on the winding side of the rolling mill measured by the size measuring instrument in real time, and perform area matching between the apparent cross-sectional area St and the expected cross-sectional area S2;

[0062] The rolling of the wire is a process involving plastic deformation and elasticity, and the size and shape of the wire after rolling are closely related to the stress state during rolling. For the rolling of the wire on the unwinding side with a uniform circular cross-section or a rectangular cross-section, if the rolling gap is horizontal, the wire being rolled will be uniformly stressed, and under this premise, the wire on the winding side will be straight and meet the size requirements. For example, as shown in Figure 3 , the cross-section of the wire rolled by the present embodiment when the rolling gap is horizontal is rectangular. However, if the rolling gap is not horizontal, the straightness of the wire will also be affected by uneven stress, resulting in various shape defects such as bending and warping, and ht, bt cannot truly reflect the height and width of the wire. As shown in Figure 4 , when the rolling gap is not horizontal, the cross-section of the rolled wire is trapezoidal, and at this time ht, bt can only reflect the maximum size value in the measured direction. We temporarily define the apparent cross-sectional area as the product of the height and width dimensions of the wire on the winding side of the rolling mill measured in real time:

[0063] St = ht * bt (8);

[0064] In the present application, by calculating the apparent cross-sectional area St of the wire at the exit of the roll (i.e. the take-up side) and matching it with the expected cross-sectional area S2, it is preliminarily determined whether the roll gap is parallel. As used herein, matching means comparing the two, and if they are equal, it is considered that the two are matched. If St = S2, it means that the matching is passed, and the cross-section of the wire at the take-up side of the roll is rectangular, and step S104 can be directly performed; if St ≠ S2, it means that the matching is not passed, and the cross-section of the wire at the take-up side of the roll is trapezoidal, and since ht and bt represent the maximum size values in the measured direction, at this time St > S2, so step S103 is first performed to make St = S2, and then step S104 is performed.

[0065] S103: When the area matching is not passed, adjusting the roll down amount of the rolling mill according to the area matching result to make the apparent cross-sectional area St match the expected cross-sectional area S2;

[0066] At this time, St ≠ S2, and the purpose of this step is to adjust the roll down amount of the rolling mill to make St = S2. In this embodiment, when adjusting the roll down amount of the rolling mill according to the area matching result, the adjustment mode is only down, and each time the down is only for one end of the upper roll. The main adjustment idea is to make a step adjustment to the left or right adjusting pressure rod, compare the change direction of the apparent cross-sectional area, determine whether the adjusting direction of the pressure rod is correct, determine the adjustment scheme, and until St and S2 are matched. The judgment and adjustment strategy is as follows: one end of the upper roll is selected to be depressed by one step, and the apparent cross-sectional area is recalculated, if the apparent cross-sectional area decreases, it means that the selected end is the target end, otherwise the other end is the target end; gradually depress the target end in steps until the apparent cross-sectional area matches the expected cross-sectional area, wherein: after each step of depression, the apparent cross-sectional area is recalculated and compared with the expected cross-sectional area, if they are equal, it means that the apparent cross-sectional area matches the expected cross-sectional area.

[0067] For example, when St ≠ S2, first select one end (such as the left end) to depress the roll on one side by one step, and determine whether St decreases, if St decreases, it means that the down direction is correct, so the left end can be continuously depressed until St = S2; otherwise, if St does not decrease, it means that the down direction is incorrect, and the down direction is changed to the right end, and the right end of the upper roll is depressed until St = S2.

[0068] S104: When the area matching is passed, the height matching of the required and real-time measured height dimensions h2 and ht of the wire is performed, and when the height matching is not passed, the roll down amount of the rolling mill is adjusted according to the height matching result to make the required and real-time measured height dimensions h2 and ht match.

[0069] At this time, St=S2, because the areas are equal, the left and right ends of the rolls are only preliminarily adjusted to be flat, and it does not mean that the rolling sizes are equal, so the purpose of this step is to adjust the roll pressing amount of the rolling mill to make ht=h2. In this embodiment, when the roll pressing amount of the rolling mill is adjusted according to the height matching result, the adjustment mode is pressing down or lifting up, and each pressing down or lifting up is simultaneously performed for the two ends of the upper roll. Specifically, the process of adjusting the roll pressing amount of the rolling mill according to the height matching result in this step is: if ht≠h2, the pressing amount of the left and right ends of the upper roll is gradually adjusted (the left and right adjusting pressure rods are simultaneously adjusted upward or downward) according to the size relationship between the real-time measured height of the wire and the required height size ht, h2 of the wire, until the real-time measured height of the wire and the required height size ht, h2 of the wire are equal, i.e., ht=h2. More specifically, at each adjustment step: if the real-time measured height size ht of the wire is greater than the required height size h2 of the wire, the left and right ends of the upper roll are simultaneously pressed down by one step; if the real-time measured height size ht of the wire is less than the required height size h2 of the wire, the left and right ends of the upper roll are simultaneously lifted up by one step.

[0070] wherein the step size is 0.1-0.2δ, and δ represents the tolerance of the wire height direction at the take-up side of the rolling mill. In this embodiment, the step size is 0.0001 mm.

[0071] It can be understood that S100 and S101 are pre-preparation steps before rolling, S102-S104 are implemented during the entire rolling process, and the matching work is repeatedly performed during the entire rolling process. For example, when S103 area matching passes, S104 continues to perform height matching; when S104 height matching passes, S102 is jumped to again to perform area matching.

[0072] Embodiment Two

[0073] Reference Figure 5 The embodiment discloses a micro-wire precision rolling system, which comprises a pay-off machine, a pay-off speed tester, a pay-off speed controller, a pay-off tension adjuster, a rolling mill, a size measuring instrument, a rolling mill controller, a take-up tension adjuster, a take-up speed tester, a take-up speed controller and a take-up machine.

[0074] The unwinding machine, the unwinding speed tester and the unwinding tension regulator are sequentially arranged at the unwinding side of the rolling mill, the winding tension regulator, the winding speed tester and the winding machine are sequentially arranged at the winding side of the rolling mill, the unwinding speed controller is connected with the unwinding machine and the unwinding speed tester respectively, and the winding speed controller is connected with the winding speed tester and the winding machine respectively; the unwinding speed tester and the winding speed tester respectively test the unwinding speed and the winding speed, and feed back to the unwinding speed controller and the winding speed controller to feedback adjust the unwinding speed and the winding speed, so that the unwinding speed and the winding speed are stably set at the set value; the unwinding tension regulator and the winding tension regulator are used for setting the tension value to respectively and real-timely adjust the unwinding tension and the winding tension. The size tester is arranged at the winding side of the rolling mill, specifically between the rolling mill and the winding tension regulator, is used for real-timely measuring the height and width of the wire material at the winding side of the rolling mill and feeding back to the rolling mill controller, and the rolling mill controller is used for measuring, feeding back and adjusting strategy, specifically performing the method steps S102-S105 in the first embodiment, and the specific process can be referred to the description of the method embodiment, which will not be described here.

[0075] Specifically, the size tester is a laser tester with the size measurement function of two directions perpendicular to each other or two laser testers vertically installed. In the embodiment, the size tester is an XY two-way laser diameter tester, which is installed on a bracket that can move forward and backward, left and right and can rotate, so that the angles of the two directions of the laser are respectively parallel and perpendicular to the surface of the wire material. In the embodiment, the selected laser diameter tester has a measurement accuracy of 0.0001 mm. In other embodiments, two laser diameter testers can be vertically arranged. In another embodiment, a contact type size tester is also feasible.

[0076] Reference Figure 6 The rolling mill can adopt an existing rolling mill, which is composed of a frame 1, an upper roller 5, a lower roller 7, an upper bearing 4, a lower bearing 8, a left adjusting pressure rod 2, a right adjusting pressure rod 3, a supporting spring 6 and the like, and the upper roller 5 and the lower roller 7 are respectively connected with a motor. The left and right ends of the upper roller 5 are respectively adjusted up and down through the left adjusting pressure rod 2 and the right adjusting pressure rod 3. In the embodiment, the rolling mill controller is connected with the size tester and the rolling mill, calculates and feeds back according to the result provided by the size tester, so as to simultaneously or individually adjust the left adjusting pressure rod 2 and the right adjusting pressure rod 3 of the rolling mill, and the adjustment step is 0.0001 mm.

[0077] It can be understood that in the micro-fine wire precision rolling system, it can be a single rolling system composed of a pay-off speed tester, a pay-off speed controller, a pay-off tension regulator, a rolling mill, a size measuring instrument, a rolling mill regulator, a take-up tension regulator, a take-up speed tester, and a take-up speed controller. A plurality of single rolling systems can also be connected in series.

[0078] As mentioned above, the rolling mill regulator is used to perform the method steps S102-S105 in Embodiment I, with reference to Figure 7 A specific process of the measurement, feedback and adjustment strategy of the rolling mill regulator is shown in another flowchart:

[0079] 1) First, compare St and S2, when St=S2, directly point to step 2), when St≠S2, execute step 3);

[0080] 2) Determine whether ht is equal to h2, if ht>h2, the upper roller left and right sides are simultaneously pressed by one step, if ht

[0081] 3) First, press the left side of the upper roller by one step, determine whether St is reduced, if St is reduced, it proves that the left side is the correct direction, otherwise, if St is not reduced, it proves that the direction is incorrect, change the direction, the right side is the correct direction, after determining the correct direction, press the correct direction by one step, after pressing one step, immediately determine whether St and S2 are equal, if not, continue to press one step, and judge, and so on, until the last step is pressed to St and S2 are equal, jump to step 2).

[0082] Compared with the prior art, the present application has the following technical advantages:

[0083] (1) By directly measuring and calculating the size of the wire on the take-up side of the roller, and by comparing the apparent cross-sectional area with the set expected cross-sectional area, the quality of the wire size and shape is determined. Compared with the machine vision, shape detection and stress testing technologies in the prior art, the method is simple, direct, high-precision and low-cost, and can realize the measurement of micro-size and small changes.

[0084] (2) It contains measurement, comparison, feedback and adjustment scheme, and can realize online measurement. Compared with the existing technology of shutdown detection and adjustment scheme, it has higher stability and production efficiency.

[0085] It should be noted that when an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements can be present. As used herein the term "and / or" includes any and all combinations of one or more of the associated listed items.

[0086] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used in the description of the application herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application.

[0087] The embodiments of the application described above are intended to be illustrative only and in no way limit the scope of the application. Various modifications of the application in addition to those described herein will become apparent to those skilled in the art from the foregoing description. Such modifications are to be considered within the scope of the application as defined by the appended claims.

Claims

1. A method of precision rolling of a micro wire material, characterized by, The method comprises: During the rolling process, the apparent cross-sectional area is calculated according to the height and width of the wire on the take-up side of the rolling mill measured by the size measuring instrument in real time; The apparent cross-sectional area is area-matched with the expected cross-sectional area, wherein the expected cross-sectional area is calculated according to the shape of the wire on the take-up side of the rolling mill determined in advance and the required height and width; When the area matching fails, the roll down amount of the rolling mill is adjusted according to the area matching result to make the apparent cross-sectional area match the expected cross-sectional area; When the area matching passes, the required height and the height measured in real time of the wire are height-matched, and when the height matching fails, the roll down amount of the rolling mill is adjusted according to the height matching result to make the required height and the height measured in real time match; The adjustment mode when the roll down amount of the rolling mill is adjusted according to the area matching result is only roll down, and each roll down is only for one end of the upper roll; the adjustment mode when the roll down amount of the rolling mill is adjusted according to the height matching result is roll down or roll up, and each roll down or roll up is simultaneously for both ends of the upper roll.

2. The method of claim 1, wherein, The adjustment of the roll down amount of the rolling mill according to the area matching result specifically comprises: One end of the upper roll is selected to be rolled down by one step, and the apparent cross-sectional area is recalculated, if the apparent cross-sectional area decreases, it means that the selected end is the target end, otherwise, the other end is the target end; The target end is gradually rolled down in steps until the apparent cross-sectional area matches the expected cross-sectional area, wherein: after each roll down by one step, the apparent cross-sectional area is recalculated and compared with the expected cross-sectional area, if they are equal, it means that the apparent cross-sectional area matches the expected cross-sectional area.

3. The method of claim 1, wherein, The adjustment of the roll down amount of the rolling mill according to the height matching result specifically comprises: The roll down amount of both ends of the upper roll is gradually adjusted simultaneously according to the size relationship between the height of the wire measured in real time and the required height of the wire until the height of the wire measured in real time and the required height of the wire are equal, wherein: at each adjustment step, if the height of the wire measured in real time is greater than the required height of the wire, both ends of the upper roll are controlled to be rolled down by one step; if the height of the wire measured in real time is less than the required height of the wire, both ends of the upper roll are controlled to be rolled up by one step.

4. The method of claim 1, wherein, The step length when rolled down is 0.1-0.2δ, the measurement accuracy of the size measuring instrument is not less than 0.2δ, and δ represents the tolerance of the wire on the take-up side of the rolling mill in the height direction.

5. The method of claim 1, wherein, The cross-sectional shape of the wire is rectangular, the apparent cross-sectional area is obtained by multiplying the height and width of the wire on the take-up side of the rolling mill measured in real time, and the expected cross-sectional area is obtained by multiplying the required height and width of the wire on the take-up side of the rolling mill determined in advance.

6. The method of claim 1, wherein, The method further comprises: predetermining a rolling factor ke, a rolling coefficient kp, an unwinding side wire material elastic modulus E1, a winding side wire material elastic modulus E2, an unwinding tension f1, a winding tension f2, an unwinding speed v1, a winding speed v2, wherein: ; The required height and width of the wire on the take-up side of the rolling mill are determined in advance, and the expected cross-sectional area is calculated; The adjustment pressure rods at both ends of the roll are adjusted to make the rolled wire meet the size requirement of rectangular cross-section and the shape requirement of straightness.

7. A micro wire precision rolling system characterized by comprising: The rolling mill, the rolling mill controller, and the size measuring instrument; the size measuring instrument is arranged on the take-up side of the rolling mill, and is used for measuring the height and width of the wire on the take-up side of the rolling mill in real time and feeding back to the rolling mill controller; the rolling mill controller is used for executing the steps of the method according to any one of claims 1-5.

8. The system of claim 7, wherein, The unwinding machine, the unwinding speed tester, the unwinding speed controller, the unwinding tension regulator, the take-up tension regulator, the take-up speed tester, the take-up speed controller, and the take-up machine; the unwinding machine, the unwinding speed tester, and the unwinding tension regulator are sequentially arranged on the unwinding side of the rolling mill; the take-up tension regulator, the take-up speed tester, and the take-up machine are sequentially arranged on the take-up side of the rolling mill; the unwinding speed controller is connected with the unwinding machine and the unwinding speed tester respectively; the take-up speed controller is connected with the take-up speed tester and the take-up machine respectively; the unwinding speed tester and the take-up speed tester respectively test the unwinding speed and the take-up speed, and feed back to the unwinding speed controller and the take-up speed controller to adjust the unwinding speed and the take-up speed, so that the unwinding speed and the take-up speed are stabilized at the set values; the unwinding tension regulator and the take-up tension regulator are used for setting the tension values to respectively adjust the unwinding tension and the take-up tension in real time.

9. The system of claim 7, wherein, The size measuring instrument is a laser measuring instrument with the size measuring function of two mutually perpendicular directions, or two laser measuring instruments installed vertically; the size measuring instrument is installed on a bracket which can move forward and backward, left and right, and rotate, so that the laser angles of the two directions are respectively parallel and perpendicular to the surface of the wire. The left and right ends of the upper roller of the rolling mill are respectively adjusted up and down by the left adjusting pressure rod and the right adjusting pressure rod; the rolling mill controller controls the downward pressure of the upper roller by simultaneously or individually adjusting the left adjusting pressure rod and the right adjusting pressure rod.

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