High-efficiency cold rolling process for special alloy precision strip

Abstract

The application provides a high-efficiency cold rolling process for special alloy precision strips, comprising the following steps: obtaining the thickness h of the target strip; if the thickness h of the target strip is greater than or equal to s, starting a large-tension output mode and a strong-contact oil removal process control strategy; if the thickness h of the target strip is less than s, starting a micro-tension fluctuation mode and a weak-contact oil removal process control strategy; rolling the target strip to a specified product thickness, and ending the rolling. According to the thickness of the strip fed back by a thickness measuring system, the power source of a high-precision cascade power system and the cylinder of a self-adaptive flexible oil removal system are automatically put into operation, which greatly increases the rolling range of the equipment and enables both thick strips and thin strips to be efficiently rolled. The large-tension output and strong-contact oil removal process control strategy is adopted for thick strips, and the micro-tension fluctuation and weak-contact oil removal process strategy is adopted for thin strips, which greatly improves the unit capacity and efficiency.

Description

TECHNICAL FIELD

[0001] The present application belongs to the field of strip rolling, and particularly relates to a high-efficiency cold rolling process for special alloy precision strips. BACKGROUND

[0002] With the wide application of strips in the fields of national defense, military industry, household appliances and microelectronics, especially the promotion of high-tech electronic products such as curved screens, the end users of products require the strips to have the strict requirements of extremely thin thickness, extremely high strength, extremely good flatness and high electrical conductivity. At present, the demand for such special alloy precision strips is extremely large in China.

[0003] The main reason for this dilemma is that the material properties of special alloys are quite different, and the main characteristics of such alloys are large hardness, difficult deformation and poor ductility. Due to the requirements far beyond the conventional metal materials, the preparation of special alloy thin strips has the following problems in actual rolling production:

[0004] (1) Low efficiency

[0005] Due to poor ductility, extremely high strength and obvious work hardening, etc., the single production line of the domestic special alloy production system can only complete the rolling of the raw materials in a certain thickness range, which causes obstacles to the full series production of special alloy precision strips and causes the product to be in short supply.

[0006] (2) Small capacity

[0007] The end users have extremely strict requirements for the residual oil on the surface of the precision strips, but the current technical means have poor oil removal effect in high-speed production. SUMMARY

[0008] The present application aims to provide a high-efficiency cold rolling process for special alloy precision strips to overcome the above technical defects.

[0009] To solve the above technical problems, the present application provides a high-efficiency cold rolling process for special alloy precision strips, which comprises:

[0010] Obtaining the thickness h of the target strip;

[0011] If the thickness h of the target strip is greater than or equal to s, starting the large tension output mode;

[0012] If the thickness h of the target strip is less than s, starting the micro-tension fluctuation mode;

[0013] Rolling the target strip to the specified product thickness by the rolling mill, and ending the rolling.

[0014] The rolling mill and the coiler arranged near the rolling mill each at least comprises a high-precision cascade power system, and the high-precision cascade power system comprises a master and a slave, wherein the tail end of the master is configured with a high-resolution encoder, and the slave is installed at the output end of the master and coaxial with the master.

[0015] The output torque of the master and the slave is the same.

[0016] If the target strip thickness h is greater than or equal to s, a large tension output mode is started, wherein the large tension output mode refers to that both the master and the slave are put into use.

[0017] If the target strip thickness h is less than s, a micro-tension fluctuation mode is started, wherein the micro-tension fluctuation mode refers to that only the master is put into use.

[0018] The high-efficiency cold rolling process of the special alloy precision strip further comprises a self-adaptive flexible oil removal system, when the large tension output mode is started, the self-adaptive flexible oil removal system starts a strong contact oil removal mode; when the micro-tension fluctuation mode is started, the self-adaptive flexible oil removal system starts a weak contact oil removal mode.

[0019] The self-adaptive flexible oil removal system comprises an oil removal roller and a supporting roller tangent to the oil removal roller, and a dot-matrix cylinder system is arranged at a position away from the tangent surface of the two.

[0020] All cylinder heads in the dot-matrix cylinder system are connected to the supporting roller.

[0021] The supporting roller comprises a roller shaft, and a plurality of roller bodies are distributed on the roller shaft, each roller body corresponds to a cylinder of the dot-matrix cylinder system, and the number of segments of the supporting roller or the number of cylinders of the dot-matrix cylinder system is odd.

[0022] The strong contact oil removal mode refers to that all cylinders of the dot-matrix cylinder system are extended to extrude the plurality of roller bodies of the corresponding supporting roller; the weak contact oil removal mode refers to that along the width direction of the target strip, the middle cylinders and the end cylinders of the dot-matrix cylinder system are extended to extrude the roller bodies of the corresponding supporting roller, and the remaining cylinders are not working.

[0023] When the shape control system of the rolling mill detects that the target strip has defects, a signal is sent to the self-adaptive flexible oil removal system, and the self-adaptive flexible oil removal system implements pre-action oil removal on the surface of the target strip, the pre-action time t=L / v, wherein L is the relative distance between the oil removal roller and the shape roller of the shape control system, and v is the advancing speed of the target strip.

[0024] The beneficial effects of the present application are as follows:

[0025] (1) According to the thickness of the target strip, the power source input condition of the high-precision cascade power system is automatically executed, the large tension output process control strategy is adopted for thicker strips, the micro-tension fluctuation process strategy is adopted for thinner strips, and high-precision tension control is completed for strips in different thickness ranges.

[0026] (2) The adaptive flexible oil removal system is proposed, which adjusts the contact stress between the oil removal roller and the target strip in real time by the position and number of the air cylinders according to the target strip thickness and target strip flatness to break the oil film in time.

[0027] (3) The high-precision cascade power system and the adaptive flexible oil removal system, which work together to complete high-precision tension control and precise oil removal for strips of different thickness ranges, greatly improve the efficiency and capacity of the unit.

[0028] In order to make the above content of the present application more obvious and easy to understand, the following preferred embodiments are described in detail below in combination with the accompanying drawings. BRIEF DESCRIPTION OF DRAWINGS

[0029] Figure 1 is a flow chart of the high-efficiency cold rolling process of the special alloy precision strip.

[0030] Figure 2 is an application diagram of the high-precision cascade power system and the adaptive flexible oil removal system.

[0031] Figure 3 is a structural schematic diagram of the high-precision cascade power system.

[0032] Figure 4 is a structural schematic diagram of the adaptive flexible oil removal system.

[0033] BRIEF DESCRIPTION OF DRAWINGS

[0034] 100. main machine;

[0035] 200. slave machine;

[0036] 310. oil removal roller; 320. supporting roller;

[0037] 400. dot matrix air cylinder system. DETAILED DESCRIPTION

[0038] The embodiments of the present application are described below by specific specific embodiments, and those skilled in the art can easily understand other advantages and effects of the present application from the content disclosed in the specification.

[0039] It should be noted that in the present application, up, down, left and right in the figure are considered as up, down, left and right of the high-efficiency cold rolling process of the special alloy precision strip described in the specification.

[0040] The exemplary embodiments of the present application will be described with reference to the accompanying drawings, in which like reference numerals can indicate like elements throughout the several figures of the drawing, and the exemplary embodiments can be applied to a variety of forms and are not limited to the embodiments described herein, which are provided to fully and completely disclose the present application and to fully convey the scope of the present application to those skilled in the art. The terms used in the exemplary embodiments represented in the accompanying drawings are not limited to the present application. In the drawings, the same elements are designated with the same reference numerals.

[0041] Unless otherwise defined, all terms (including 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. It will be further understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the relevant art and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein.

[0042] The special alloy is an iron-carbon alloy formed by adding an appropriate amount of one or more alloying elements to ordinary carbon steel; the very thin strip refers to a metal strip with a thickness of less than or equal to 0.02-0.03 mm, and generally refers to a strip with a thickness of less than or equal to 0.05 mm.

[0043] The rolling mill is a device for realizing the metal rolling process, which has a thickness measuring system for detecting the thickness of the strip (or plate) and a shape control system for detecting the shape change of the plate. Since the thickness measuring system and the shape control system are conventional equipment attached to the rolling mill, they will not be described here.

[0044] The present embodiment relates to a high-efficiency cold rolling process for special alloy precision strips, which comprises:

[0045] Step 1: Obtain the thickness h of the target strip.

[0046] Specifically, the thickness of the target strip is detected by the thickness measuring system.

[0047] Step 2: According to the thickness of the target strip, different process control strategies are customized.

[0048] If the thickness h of the target strip is greater than or equal to s, the large tension output mode is started.

[0049] If the thickness h of the target strip is less than s, the micro-tension fluctuation mode is started.

[0050] The target strip thickness h here actually refers to the entry thickness of the target strip. If the target strip thickness h is greater than or equal to 0.1 mm, i.e. s = 0.1 mm, the target strip thickness is thick, and since a large tension output is required for thick strips and the strips have a certain anti-interference ability to tension fluctuation, a large tension output mode is started. If the target strip thickness h is less than 0.1 mm, the target strip thickness is thin, and since only a small tension output is required for thin strips but the tension fluctuation is required to be very small, a small output torque is required, so a micro-tension fluctuation mode is started.

[0051] It is worth mentioning that the value of s can also be selected according to the requirements of the rolling process, and is not limited to 0.1 mm.

[0052] Step 3: Execute the process control strategy.

[0053] The rolling mill rolls the target strip to the specified product thickness, and the rolling ends.

[0054] Please refer to Figure 2 , the rolling mill and the coiler arranged near the rolling mill each include a high-precision cascade power system, which focuses on solving the technical difficulty of a small rollable thickness range of the unit. This is because a large tension output is required for thick strips and the strips have a certain anti-interference ability to tension fluctuation, but only a small tension output is required for thin strips but the tension fluctuation is required to be very small, otherwise, a malignant accident such as strip breakage is likely to occur.

[0055] As shown in Figure 3 , the high-precision cascade power system includes a master machine 100 and a slave machine 200, and the carrying capacity (output torque) of the master machine 100 and the slave machine 200 is the same, i.e. T 主 = T 从 . Moreover, the slave machine 200 is installed at the output end of the master machine 100, i.e. the master machine 100 and the slave machine 200 are coaxially arranged and only the tail end of the master machine 100 is configured with a high-resolution encoder. The resolution of the encoder is 4096, and the high-resolution encoder is mainly used to record the speed and other key information of the system in real time.

[0056] If the target strip thickness h is greater than or equal to s, a large tension output mode is started, wherein the large tension output mode refers to that the master machine 100 and the slave machine 200 are both put into use, so that a larger tension rolling can be realized, because the total output torque of the power system is about 2 times that of thin strip rolling, i.e. T max = T 主 + T 从 = 2T 主 .

[0057] If the target strip thickness h < s, the micro tension fluctuation mode is started, wherein the micro tension fluctuation mode refers to only the master machine 100 is put into use, and since the output torque is small at this time, the tension fluctuation value AT caused by the same control precision of the equal percentage m% of the tension fluctuation is about 50% of that in the thick strip rolling, which provides a necessary condition for the stable rolling of the thin strip, i.e. AT = T 主 m% = 1 / 2T max m%.

[0058] The linkage control of the thickness measuring system and the high-precision cascade power system can realize the execution of the master machine 100 and / or the slave machine 200 according to the strip thickness, i.e. by automatically adjusting the input mode of the master machine 100 and the slave machine 200, the maximum rollable thickness of the high-precision cascade power system can reach 50 times of the minimum rollable thickness, which greatly expands the rollable thickness range of the equipment, and the tension control precision of the system is 1% of the maximum output tension, so that the efficient rolling of the extremely thin strip of 0.01 mm can be completed.

[0059] In combination Figure 1 and Figure 4 , the high-efficiency cold rolling process of the special alloy precision strip further includes a self-adaptive flexible oil removal system, and the main function of the self-adaptive flexible oil removal system is to complete the efficient oil removal of the special alloy. When the large tension output mode is started, the self-adaptive flexible oil removal system starts the strong contact oil removal mode; when the micro tension fluctuation mode is started, the self-adaptive flexible oil removal system starts the weak contact oil removal mode.

[0060] In other words, according to the target strip thickness, not only the large tension output mode or the micro tension fluctuation mode is selected to be started, but also the strong contact oil removal mode or the weak contact oil removal mode of the self-adaptive flexible oil removal system needs to be executed, i.e. the high-precision cascade power system and the self-adaptive flexible oil removal system, the two subsystems work together to complete the high-precision tension control and precise oil removal implementation of the strip with different thickness ranges.

[0061] Referring to Figure 4 , the self-adaptive flexible oil removal system includes an oil removal roller 310, which is a 30 mm copper roller to prevent scratching the surface of the strip, and the oil removal roller 310 is configured with a support roller system to reduce the deformation of the equipment during the oil removal process.

[0062] According to the size of the contact force required, the support roller system can be composed of one or more layers of support rollers 320, and the support rollers 320 and the oil removal roller 310 are tangent, and a dot matrix cylinder system 400 is arranged at the position away from the tangent surface of the two, and the dot matrix cylinder system 400 refers to a plurality of cylinders arranged in a dot matrix manner.

[0063] The support roller 320 comprises a roller shaft on which a plurality of roller bodies are distributed, each roller body corresponding to a cylinder of the dot-matrix cylinder system 400, and the number of segments of the support roller 320 or the number of cylinders of the dot-matrix cylinder system 400 is odd.

[0064] All cylinder heads in the dot-matrix cylinder system 400 are connected to the support roller 320, and the outermost support roller 320 is composed of a plurality of coaxially arranged segments to work in cooperation with the cylinder system and form a linkage control with the plate-shaped control system.

[0065] Specifically, the outermost support roller 320 of the adaptive flexible oil removal system is connected to the dot-matrix cylinder system 400 through a roller box, because the response speed of the cylinder is much higher than that of the oil cylinder, and the cylinder can achieve flexible oil removal on the surface of the strip without causing changes in the plate shape and thickness of the strip; and the cylinder system is symmetrically arranged about the center line of the unit, and the number of cylinders is odd and the same as the number of segments of the outermost support roller 320 of the support roller system to complete one-to-one precise control.

[0066] The main function of the dot-matrix cylinder system 400 is to adjust the contact stress between the oil removal roller 310 and the strip in real time to break the oil film in time.

[0067] If the target strip thickness h is greater than or equal to s, the large tension output mode and the strong contact oil removal mode are started, the strong contact oil removal mode refers to all cylinders of the dot-matrix cylinder system 400 are extended to extrude the corresponding segments of the support roller 320, that is, the dot-matrix cylinder system 400 of the adaptive flexible oil removal system puts all the cylinders into work when the thickness of the strip is greater than or equal to 0.1 mm, at this time, a larger contact stress can be output on the thicker strip without causing a large impact on the thickness of the strip.

[0068] If the target strip thickness h is less than s, the micro-tension fluctuation mode and the weak contact oil removal mode are started, the weak contact oil removal mode refers to along the width direction of the target strip, the middle cylinders and the end cylinders of the dot-matrix cylinder system 400 are extended to extrude the corresponding roller bodies of the support roller 320, and the remaining cylinders are not working. That is, the dot-matrix cylinder system 400 of the adaptive flexible oil removal system only puts three cylinders in the middle and at both ends of the plate width direction into work when the thickness of the strip is less than 0.1 mm, at this time, a smaller contact stress can be output on the thinner strip, so as to achieve the purpose of efficient oil removal without adversely affecting the plate thickness and plate shape of the strip.

[0069] The dot-matrix cylinder system 400 of the adaptive flexible oil removal system cooperates with the plate-shaped control system to control and implement the pre-acting oil removal on the surface of the strip, specifically as follows:

[0070] When the plate shape control system of the rolling mill detects that the target strip has defects, a signal is sent to the adaptive flexible oil removal system, and the adaptive flexible oil removal system implements pre-acting oil removal on the surface of the target strip, the pre-acting time t=L / v (that is, the pre-acting time is positively related to the relative distance between the oil removal roller 310 and the plate shape roller of the plate shape control system and the advancing speed of the target strip), wherein L is the relative distance between the oil removal roller 310 and the plate shape roller of the plate shape control system, and v is the advancing speed of the target strip, that is, the advancing speed of the strip, so that the obtained t is the time required for the strip to pass through the distance. That is, after the t time detected by the plate shape roller, the defect advances to the oil removal roller at a speed v and is extruded and removed by the oil removal roller.

[0071] Therefore, the plate shape control system detects that the strip plate shape has defects and sends a signal to the adaptive flexible oil removal system, and the adaptive flexible oil removal system will adjust the contact stress for the plate shape of the strip accurately after t seconds, such as increasing the contact stress of the area where the wave shape exists. Through the cooperation control of the plate shape control system, the single-sided residual oil amount of the adaptive flexible oil removal system can be controlled to be 120 mg / m 2 .

[0072] In summary, as Figure 1 shown, the high-efficiency process control strategy suitable for special alloy fine strips includes:

[0073] Starting of the high-efficiency cold rolling production system suitable for special alloy fine strips;

[0074] If the strip inlet thickness is greater than or equal to 0.1 mm, the process control strategy of large tension output and strong contact oil removal is adopted, the master and slave machines of the high-precision cascade power system are put into use, and all the air cylinders of the adaptive flexible oil removal system are put into use;

[0075] If the strip inlet thickness is less than 0.1 mm, the process control strategy of micro-tension fluctuation and weak contact oil removal is adopted, only the master machine of the high-precision cascade power system is put into use, and only the three air cylinders of the middle and both ends of the adaptive flexible oil removal system are put into use;

[0076] The air cylinder system of the adaptive flexible oil removal system is adaptively adjusted according to the plate shape information;

[0077] When the specified product thickness is reached, the rolling is finished.

[0078] According to the plate thickness information fed back by the thickness measuring system, the application automatically executes the corresponding process control strategy, and high-precision tension control and accurate oil removal implementation can be completed on strips of different thickness ranges. The application greatly improves the production capacity and efficiency of the mill, and has great economic and social benefits.

[0079] Those skilled in the art can understand that the above-mentioned embodiments are specific examples for implementing the present application, and various changes can be made in form and details in practical application without departing from the spirit and scope of the present application.

Claims

1. A process for high efficient cold rolling of special alloy precision strips, characterized in that, The application comprises: acquiring the thickness h of the target strip; if the thickness h of the target strip is greater than or equal to s, starting a large tension output mode and a strong contact oil removal mode; if the thickness h of the target strip is less than s, starting a micro tension fluctuation mode and a weak contact oil removal mode; rolling the target strip to a specified product thickness by a rolling mill, and ending the rolling; wherein the large tension output mode and the micro tension fluctuation mode are executed by a high-precision cascade power system, and the strong contact oil removal mode and the weak contact oil removal mode are executed by a self-adaptive flexible oil removal system; the rolling mill and a coiler arranged near the rolling mill each comprise at least a high-precision cascade power system, and the high-precision cascade power system comprises a master machine (100) and a slave machine (200); the micro tension fluctuation mode refers to only the master machine (100) being in use; the self-adaptive flexible oil removal system comprises an oil removal roller (310) and a support roller (320) tangent to the oil removal roller (310), and a dot-matrix cylinder system (400) is arranged at a position away from the tangent surface of the two, and all cylinder heads in the dot-matrix cylinder system (400) are connected to the support roller (320); the support roller (320) comprises a roller shaft, and a plurality of roller bodies are distributed on the roller shaft, each roller body corresponds to a cylinder of the dot-matrix cylinder system (400), and the number of segments of the support roller (320) or the number of cylinders of the dot-matrix cylinder system (400) is odd; the strong contact oil removal mode refers to all cylinders of the dot-matrix cylinder system (400) being extended to extrude the plurality of roller bodies of the corresponding support roller (320); the weak contact oil removal mode refers to, along the width direction of the target strip, the middle cylinders and the end cylinders of the dot-matrix cylinder system (400) being extended to extrude the roller bodies of the corresponding support roller (320), and the remaining cylinders being not in operation; when a plate shape control system of the rolling mill detects that the target strip has a defect, a signal is sent to the self-adaptive flexible oil removal system, and the self-adaptive flexible oil removal system performs a pre-acting oil removal on the surface of the target strip, and the pre-acting time t is equal to L / v, wherein L is the relative distance between the oil removal roller (310) and the plate shape roller of the plate shape control system, and v is the advancing speed of the target strip; the special alloy is an iron-carbon alloy formed by adding an appropriate amount of one or more alloying elements to ordinary carbon steel; the thickness h of the target strip refers to the inlet thickness of the target strip; s=0.1 mm.

2. The high efficiency cold rolling process of precision strips of special alloys, as claimed in claim 1, characterized in that, a high-resolution encoder is arranged at the tail end of the master machine (100), and the slave machine (200) is mounted at the output end of the master machine (100) and coaxial with the master machine (100); the output torques of the master machine (100) and the slave machine (200) are the same.

3. The high efficiency cold rolling process of special alloy precision strip as claimed in claim 1 or 2, wherein, if the thickness h of the target strip is greater than or equal to s, a large tension output mode is started, wherein the large tension output mode refers to that both the master machine (100) and the slave machine (200) are in use.

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