Rolling method of elastic alloy strip foil for sensor

Abstract

The invention relates to a rolling method of an elastic alloy strip foil for a sensor, which adopts a multi-time cold rolling method combined with intermediate softening annealing treatment, and obtains an elastic alloy strip foil with the thickness of delta 0.05-0.3 mm, the width of more than 300mm, the thickness precision tolerance of + / -3 mu m, the thickness of more than or equal to 4mm and the thickness of less than or equal to 4mm by controlling the rolling force and the rolling tension and adjusting the transverse twitching position of an intermediate roller and the convexity of a support roller and the like. According to the cold-rolled elastic alloy strip foil material, the problems of easy strip breakage, poor plate shape, large edge wave and the like during cold rolling are solved, the production efficiency of the product is high, the quality is good, the production cost is low, the production efficiency is high, and the production cost is low. And the requirements of wide, ultrathin and high-gauge-quality elastic alloy strip foil for preparing high-precision sensor diaphragms in the fields of aerospace, automobiles, communication and consumer electronics, nuclear power, petrochemical engineering and the like can be met.

Description

Technical Field

[0001] The invention belongs to the field of elastic alloy materials, and in particular relates to a precision rolling method for elastic alloy strip foil with wide width, high precision and plate shape quality for sensors. Background Art

[0002] Sensors, as the "senses" and "nerves" of spacecraft, are located in various key parts of spacecraft and are at the forefront of information collection. They usually serve in extremely harsh environments such as ultra-low temperature, strong radiation, high vacuum, and high speed. They are an effective means to ensure that measurements can be taken accurately, predictions are correct, and diagnosis is sensitive, thereby ensuring the success rate of missions. Since the measurement of pressure sensors will drift with changes in the working environment and static pressure, in order to reduce the occurrence of drift, it is necessary to ensure accurate and stable measurement of pressure values ​​within the working temperature range. Due to the particularity of the spacecraft's on-orbit environment, the measurement accuracy of the sensor is out of tolerance or fails, which may directly lead to accidents such as orbit change failures. Therefore, sensors play a key role in ensuring the safety of astronauts and the normal operation of spacecraft and are of great importance.

[0003] The detection accuracy of diaphragm pressure sensors is closely related to the selected material characteristics, structural design, welding process and other factors. Metal diaphragm materials are the key materials for the feedback of pressure values ​​of pressure sensors. They have great advantages in sensitivity. Their material, maximum thickness, width, dimensional accuracy and uniformity, surface and plate quality, mechanical properties, etc. are closely related to the measurement accuracy. Many common elastic sensitive metal materials such as beryllium bronze, tin bronze and stainless steel (1Cr18Ni9Ti) have insufficient load capacity and resistance to external interference, which affects the detection performance of the sensor output itself. Elastic alloy strip foil is the key basic material required for aerospace pressure sensors due to its simple structure, good dynamic response, good temperature stability, stable elasticity and mechanical properties, extremely low elastic aftereffect and corrosion resistance.

[0004] With the rapid development of aerospace technology, the requirements for the stability and measurement accuracy of pressure sensors are getting higher and higher. The performance requirements of elastic alloy strips and foils used to prepare sensors are: thickness δ0.05~0.3mm, width greater than 300mm, thickness accuracy tolerance ±3μm, same plate difference ≤1.5μm, surface roughness Ra≤0.2μm, and unevenness reaches 1mm / twice the width. Since the microstructure of elastic alloys is different from other types of alloy materials, it is mainly reflected in: (1) simple structure, less strengthening phase, and stable phase structure; (2) less defects, easy deformation, easy to control segregation, uniform element distribution, less defect structures such as dislocations, vacancies, and grain boundaries, low deformation resistance during cold deformation, and slow work hardening rate; (3) many slip systems, low anisotropy, easy dislocation slip, and isotropy. During the rolling deformation process, especially the strips and foils with large width-to-thickness ratio are significantly affected by grains, textures, surface morphology, and transient temperature, and there is local instability. The rolling method plays a very important role in improving the dimensional accuracy and plate quality of strip foil.

[0005] After searching, invention patent 1: A high magnetic induction non-oriented high silicon steel ultra-thin strip and its preparation and application (Announcement No.: CN118895412 A), adopts warm rolling + cold rolling, and controls the annealing temperature, warm rolling temperature, number of passes and reduction rate to obtain high magnetic induction non-oriented high silicon steel with a thickness of ≤0.1mm. However, the technology targets different materials, and focuses on the limit thickness and magnetic properties, without explaining the control of dimensional accuracy and plate quality. Invention patent 2: Rolling method of ultra-thin wide-width high-grade non-oriented silicon steel and non-oriented silicon steel produced (patent number: CN 118663692 A), adopts multiple cold rolling methods, and controls the reduction distribution, tension control, roller system ratio, emulsion system parameters, control mode adjustment, etc. to obtain high-grade non-oriented silicon steel with a thickness of ≤0.1mm and a width of more than 1000mm. However, the technology targets different materials, and focuses on the limit thickness, width and plate quality, without explaining the control of dimensional accuracy. Invention Patent 3: A method for preparing high-purity nickel strip foil for the electronics industry (publication number: CN 111118304 A), which uses a dual melting method of vacuum induction melting (VIM) and protective atmosphere electroslag remelting (PESR) to improve the surface quality and internal metallurgical quality of nickel strip foil. However, this technology targets different materials and does not describe the control of limit size, dimensional accuracy and plate quality. Invention Patent 4: A method for rolling wide-width metal strip foil (publication number: WO 2022 / 217717 A1), which uses a rolling mill with unequal diameter working rolls to roll the strip foil to obtain a wider, thinner and more ideal plate-shaped strip foil. This technology involves special tooling and methods. Patent 5: An iron-nickel-based high-temperature alloy, ultra-thin strip foil and preparation method (Announcement No.: CN 116590576 A), for an iron-nickel-based high-temperature alloy material, a VIM+electroslag remelting (ESR) dual smelting process is used to obtain a strip foil with a thickness of δ≤0.01mm through multiple cold rolling. However, the technology targets different materials, and the control of dimensional accuracy and plate quality is not described. Patent 6: A low residual stress nickel-based high-temperature alloy foil and its preparation method and application (Announcement No.: CN 117587298B), for an iron-nickel-based high-temperature alloy material, a low residual stress nickel-based high-temperature alloy foil with a thickness of δ0.03~0.15mm is obtained by composition design, controlling multiple refining temperatures, pouring temperatures, and stress annealing temperatures. However, the technology targets different materials, and the control of dimensional accuracy and plate quality is not described.

[0006] At present, in the precision rolling method of elastic alloy strip foil, how to control the incoming material state of the billet, adopt a twenty-roll precision rolling mill, formulate a reasonable rolling process, and obtain elastic alloy precision strip foil with indicators such as ultimate thickness, width, dimensional accuracy, dimensional uniformity, surface and plate quality that meet the international advanced level, is a problem that needs to be solved urgently. Summary of the invention

[0007] In view of the above problems, the present invention proposes a rolling method for elastic alloy strip foil for sensors. The method can effectively produce wide, ultra-thin, high-gauge quality elastic alloy strip foil for preparing high-precision sensor diaphragms in the fields of aerospace, automobile, communication and consumer electronics, nuclear power and petrochemical, etc., which meets the requirements of dimensional accuracy, dimensional uniformity, surface and plate quality.

[0008] The technical solution described in the present invention is: The rolling method of elastic alloy strip foil for sensor is as follows: the raw material billet of δ1.5-2.0mm is subjected to ≥3 cold rollings, intermediate softening annealing is required after each cold rolling, and the pressing rolling force and rolling tension are controlled, and the lateral pulling position of an intermediate roller and the convexity of a supporting roller are adjusted to roll the alloy strip foil with a thickness of δ0.05-0.3mm, a width greater than 300mm, a thickness accuracy tolerance of ±3μm, and an unevenness of 1mm / twice the width.

[0009] The above-mentioned single cold rolling adopts a two-roll, four-roll or six-roll rolling mill, with at least 5 cold rolling passes, a single pass ≤ 25%, a total pass reduction rate of 32% to 50%, so that the strip thickness is δ1.0mm and the thickness tolerance is ±0.03mm.

[0010] The above-mentioned secondary cold rolling adopts a twenty-high rolling mill, the number of cold rolling passes is at least 5 times, the single pass is ≤15%, the total pass reduction rate is 32% to 50%, the working roll diameter is Ф23-27mm, the accuracy is ±0.002mm, the hardness is HRC61~63, the tension adjustment range is 30-50kN, the rolling force adjustment range is 250-400kN, and the intermediate tapered roll type is a flat roll + roll end taper, so that the strip thickness is δ0.5mm, and the thickness tolerance is ±0.02mm; Preferably, the lateral twitching position of the intermediate tapered roller is: the upper roller of the first four passes is 30-40 mm away from the zero position on the operating side, and the lower roller is 35-47 mm away from the zero position on the transmission side; the upper roller of the last four passes is 15-30 mm away from the zero position on the operating side, and the lower roller is 18-35 mm away from the zero position on the transmission side; Preferably, the roller body length of the intermediate tapered roller is 85-110 mm, the roller end taper is 0.1-0.2 mm, and the convexity from the transmission side to the operating side 1-5# is 10-15 mm, 19-23 mm, 27-28 mm, 19-23 mm, and 10-15 mm respectively.

[0011] The above three cold rollings are performed by a twenty-high rolling mill, with at least five cold rolling passes, a single pass ≤17%, and a total pass reduction rate of 40% to 60%. The working roll diameter is Ф20-26mm, the precision is ±0.002mm, the hardness is HRC61-63, the tension adjustment range is 20-35kN, the rolling force adjustment range is 200-300kN, the working roll type is a flat roll, and the middle tapered roll type is a flat roll body + roll end taper, so that the strip thickness is δ0.2-δ0.3mm, and the thickness tolerance is ±0.01mm; Preferably, the lateral twitching position of the intermediate tapered roller is: the upper roller is 20-25mm away from the zero position on the operating side in the first four passes, and the lower roller is 25-30mm away from the zero position on the transmission side; the upper roller is 15-23mm away from the zero position on the operating side in the last four passes, and the lower roller is 17-25mm away from the zero position on the transmission side; Preferably, the roller body length of the intermediate tapered roller is 85-110 mm, and the roller end taper is 0.1-0.2 mm; the convexity from the transmission side to the operating side 1-5# is 8-16 mm, 21-24 mm, 25-28 mm, 21-24 mm, and 5-16 mm respectively.

[0012] If the thickness of the strip foil is less than δ0.3mm, four or five cold rollings are required.

[0013] If the thickness of the strip to be rolled is less than δ0.2~0.3 mm, four cold rollings are required, and the strip obtained after three cold rollings is subjected to intermediate softening annealing before cold rolling; Preferably, the intermediate softening annealing method is as follows: after the cold-rolled strip is degreased, cleaned and dried, it is softened and annealed in a hydrogen protective atmosphere at 1020~1060°C, and the belt speed of the softening annealing is controlled to be 5.0~7.0m / min to ensure that the hardness value of the strip foil is HV<240. The four cold rollings are performed using a twenty-roll rolling mill, with at least 5 cold rolling passes, a single pass ≤17%, and a total pass reduction rate of 50%~65%. The working roll diameter is Ф18-20mm, the accuracy is ±0.002mm, the hardness is HRC61~63, the tension adjustment range is 10-15kN, the rolling force adjustment range is 100-200kN, the working roll type is a flat roll, and the intermediate tapered roll type is a flat roll with a roll body + roll end taper, so that the strip thickness is δ0.1~0.15mm, and the thickness tolerance is ±0.005mm; Preferably, the lateral twitching position of the intermediate tapered roller is: the upper roller is 18-20mm away from the zero position on the operating side in the first three passes, and the lower roller is 20-25mm away from the zero position on the transmission side; the upper roller is 10-18mm away from the zero position on the operating side in the last four passes, and the lower roller is 15-20mm away from the zero position on the transmission side; Preferably, the roller body length of the intermediate tapered roller is 85-110 mm, the roller end taper is 0.1-0.2 mm, and the convexity from the transmission side to the operating side 1-5# is 2-14 mm, 19-21 mm, 24-26 mm, 19-21 mm, and 1-14 mm respectively.

[0014] If the thickness of the strip to be rolled is less than δ0.1~0.15mm, five cold rollings are required, and the strip obtained after four cold rollings is subjected to intermediate softening annealing before cold rolling; Preferably, the intermediate softening annealing method is as follows: after the cold-rolled strip is degreased, cleaned and dried, it is softened and annealed in a hydrogen protective atmosphere at 1020-1060°C, and the tape speed of the softening annealing is controlled to be 7.0-10.0 m / min to ensure that the hardness value of the strip foil HV<240.

[0015] The five cold rollings are performed by a twenty-high rolling mill, with at least five cold rolling passes, a single pass ≤16%, and a total pass reduction rate of 45% to 65%. The working roll diameter is Ф15-18mm, the precision is ±0.002mm, the hardness is HRC61-63, the tension adjustment range is 5-10kN, the rolling force adjustment range is 100-200kN, the working roll type is a flat roll, and the middle tapered roll type is a flat roll body + roll end taper, so that the strip thickness is δ0.05-0.08mm, and the thickness tolerance is ±0.002mm; Preferably, the lateral twitching position of the intermediate tapered roller is: the upper roller is 18-22 mm away from the zero position on the operating side in the first three passes, and the lower roller is 20-25 mm away from the zero position on the transmission side; the upper roller is 8-18 mm away from the zero position on the operating side in the last four passes, and the lower roller is 12-20 mm away from the zero position on the transmission side; Preferably, the roller body length of the intermediate tapered roller is 85-110 mm, the roller end taper is 0.1-0.2 mm, and the convexity from the transmission side to the operating side 1-5# is 2-13 mm, 20-22 mm, 21-24 mm, 16-22 mm, and 2-13 mm respectively.

[0016] The intermediate softening annealing method: after the cold-rolled strip is degreased, cleaned and dried, it is softened and annealed in a hydrogen protective atmosphere at 1020-1060°C, and the strip speed of each softening annealing is controlled to ensure that the hardness value of the strip foil is HV<240; Preferably, the conveyor speed of the first intermediate softening annealing is 0.5~2.0m / min; the conveyor speed of the second intermediate softening annealing is 2.0~5.0m / min; the conveyor speed of the third intermediate softening annealing is 5.0~7.0m / min; the conveyor speed of the fourth intermediate softening annealing is 7.0~10.0m / min.

[0017] The elastic alloy raw material billet described in the present application has the following weight percentages of the alloy components: C ≤0.05%; Si ≤0.80%; Mn ≤0.80%; Ni 41.5-43.0%; Cr 5.2-5.8%; Ti 2.3-2.7%; Al 0.5-0.8%; the remainder is Fe and impurities, wherein the total amount of impurities is ≤0.04%.

[0018] The impurities are S, P, Cu, O, N, and H, and their respective weight percentages are S≤0.01%; P≤0.015%; Cu≤0.01%; O≤0.0020%; N≤0.0050%; and H≤0.0001%.

[0019] The content of non-metallic inclusions of types A, B, and C (coarse and fine) in the billet is ≤1.0, the content of non-metallic inclusions of type D (coarse and fine) is ≤1.5, and the total content of non-metallic inclusions is not more than level 1.5.

[0020] The thickness of the blank is δ1.5~2.0mm, the width is 320~360mm, the thickness accuracy tolerance is ±0.05mm, the surface roughness Ra≤1.0μm, the hardness ≤260HV, there is no sickle bend, the surface is bright and clean, and there are no scratches, folds, peeling, pits, pitting, oxidation color and other defects in the soft coil.

[0021] Beneficial effects of the present invention: 1) The invention discloses a precision rolling method for elastic alloy strip foil for sensors, which adopts multiple cold rolling methods combined with intermediate softening annealing processes. The twenty-high rolling mill does not need to be equipped with a plate shape tester and a control module. By distributing pressure, tension control, adjusting the lateral twitching position of an intermediate roller and the convexity of the BC support roller, etc., the production of elastic alloy strip foil products with a thickness of δ0.05-0.3mm, a width greater than 300mm, a thickness accuracy tolerance of ±3μm, a bright and clean surface, and no defects such as scratches, folds, peeling, pits, pits, oxidation color, etc., and an unevenness of 1mm / twice the width is achieved, which solves the problems of easy strip breakage, poor plate shape, and large edge waves during cold rolling, ensures production efficiency and product quality, and is conducive to industrial promotion; 2) The production method meets the high quality requirements of wide, ultra-thin, high gauge quality elastic alloy strip foil for the preparation of high-precision sensor diaphragms in the fields of aerospace, automobiles, communications and consumer electronics, nuclear power and petrochemicals. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 The present invention provides a schematic flow chart of a method for rolling a wide, ultra-thin, high-gauge-quality elastic alloy strip foil.

[0023] Figure 2The dimensions and tolerances of typical cold-rolled strip foils manufactured according to the above scheme (specifications are thickness δ0.05mm and width 335mm).

[0024] Figure 3 This is the surface quality of a typical cold-rolled strip foil manufactured according to the above scheme (specifications are thickness δ0.05mm and width 335mm).

[0025] Figure 4 This is the unevenness of a typical cold-rolled strip foil manufactured according to the above scheme (specifications are thickness δ0.05mm and width 335mm). DETAILED DESCRIPTION

[0026] The following is a further detailed description of the specific implementation of the present invention by describing the embodiments with reference to the accompanying drawings. The production method comprises the following steps: The elastic alloy raw material billet is used, and its composition is shown in Table 1.

[0027] Table 1 Composition of elastic alloy raw material billet (wt%)

[0028] Table 2 Specifications and properties of elastic alloy raw material billets

[0029] The material of the present invention is prepared as follows: Figure 1-Figure 4 Example 1

[0030] The above elastic alloy raw material billet is used to roll a finished product with a size of δ0.3mm*335mm.

[0031] Step (1) cold rolling once, using a four-roll cold rolling mill, cold rolling passes 8 times, single pass reduction ≤ 25%, total pass reduction rate 50%, so that the strip thickness reaches δ1.0mm, thickness tolerance ±0.03mm; Step (2), secondary cold rolling, the cold-rolled strip is degreased, cleaned and dried, and then softened and annealed in a hydrogen protective atmosphere at 1060°C, with a conveying speed of 0.8m / min and a hardness value of 230 <HV<240; Step (3), secondary cold rolling, using a twenty-high rolling mill, 8 cold rolling passes, single pass ≤15%, total pass reduction rate 50%, the working roll diameter is Ф25.7mm, the accuracy is ±0.002mm, the hardness is HRC62, the front / rear tension is 44 / 42, 45 / 44, 50 / 47, 47 / 48, 46 / 47, 44 / 40, 36 / 41, 34 / 32kN, the rolling force is 290, 390, 320, 337, 365, 293, 348, 340kN, the working roll type is a flat roll, the middle tapered roll type is a flat roll body + roll end taper, the lateral pulling position of the middle roll and the BC support roll convexity are adjusted as follows: the upper roll distance from the operating side zero position of the first four passes is 40, 40, 31, 30mm respectively, and the lower roll distance from the transmission side zero position is 46, 47 respectively. , 36, 35mm, the distance between the upper roller and the operating side zero position in the last four passes is 22, 26, 17, 17mm respectively, and the distance between the lower roller and the transmission side zero position is 25, 21, 19, 19mm respectively. The length of the intermediate tapered roller is 110mm, and the taper of the roller end is 0.18mm. The convexity from the transmission side to the operating side 1-5# is 15 / 23 / 28 / 23 / 15mm, 15 / 2 3 / 28 / 23 / 15mm, 15 / 23 / 28 / 23 / 15mm, 14 / 22 / 28 / 22 / 14mm, 14 / 22 / 28 / 22 / 14mm, 13 / 20 / 27 / 20 / 13mm, 12 / 20 / 27 / 20 / 12mm, 10 / 19 / 27 / 19 / 10; the strip thickness reaches δ0.5mm, and the thickness tolerance is ±0.02mm; Step (4), after the cold-rolled strip is degreased, cleaned and dried, it is softened and annealed in a hydrogen protective atmosphere at 1060°C, with a strip speed of 3m / min; In step (5), three cold rollings are performed using a twenty-high rolling mill, the number of cold rolling passes is 8, the single pass is ≤17%, the total pass reduction rate is 40%, the working roll diameter is Ф25.2mm, the accuracy is ±0.002mm, the hardness is HRC62, the front / rear tensions are 30 / 35, 29 / 34, 28 / 34, 29 / 29, 29 / 28, 27 / 26, 25 / 25, 24 / 24kN, the rolling forces are 250, 268, 294, 292, 243, 235, 210, 210kN, the working roll type is a flat roll, the type of an intermediate tapered roll is a flat roll body + roll end taper, and the lateral pulling position of an intermediate roll and the convexity of the BC support roll are adjusted as follows: the distance between the upper roll and the operating side zero position in the first four passes is 25, 24, 22, 20mm, respectively, and the distance between the lower roll and the transmission side zero position is 28 , 28, 26, 25mm, the distance between the upper roller and the zero position of the operating side in the last four passes is 20, 18, 18, 16mm respectively, and the distance between the lower roller and the zero position of the transmission side is 24, 22, 20, 18mm respectively. The length of the intermediate tapered roller is 110mm, and the taper of the roller end is 0.18mm. The convexity from the transmission side to the operating side 1-5# is 16 / 24 / 28 / 24 / 16mm per pass, 16 / 24 / 28 / 24 / 16mm, 16 / 23 / 28 / 23 / 16mm, 15 / 22 / 28 / 22 / 15mm, 14 / 22 / 28 / 22 / 14mm, 12 / 22 / 26 / 22 / 10, 12 / 22 / 26 / 21 / 10, 10 / 21 / 26 / 21 / 8, so that the strip thickness reaches δ0.3mm, and the thickness tolerance is ±0.01mm. Example 2

[0032] The elastic alloy raw material billet is used to roll a δ0.1mm*335mm finished product.

[0033] Steps (1) to (4) are the same as those in Example 1; Step (5), three times of rolling, using a twenty-high rolling mill, 8 cold rolling passes, single pass ≤17%, total pass reduction rate 50%, working roll diameter Ф20.8mm, accuracy ±0.002mm, hardness HRC62, front / rear tensions are 29 / 34, 30 / 34, 32 / 34, 29 / 29, 29 / 28, 24 / 25, 21 / 23, 20 / 21 kN, rolling forces are 218, 272, 297, 287, 237, 245, 263, 237 kN, working roll type is flat roll, one intermediate tapered roll type is roll body flat roll + roll end taper, adjust the lateral pulling position of one intermediate roll and the convexity of the BC support roll as follows: the distance between the upper roll and the operating side zero position in the first four passes is 23, 23, 22, 22 mm, and the distance between the lower roll and the transmission side zero position is 29, 27, 287, 297, 287, 237, 245, 263, 237 kN, respectively. , 25, 25mm, the distance between the upper roller and the zero position of the operating side in the last four passes is 23, 22, 20, 16mm respectively, and the distance between the lower roller and the zero position of the transmission side is 22, 21, 19, 17mm respectively. The length of the intermediate tapered roller is 110mm, and the taper of the roller end is 0.18mm. The convexity from the transmission side to the operating side 1-5# per pass is 15 / 23 / 28 / 23 / 15mm, 15 / 23 / 28 / 23 / 15mm, 13 / 23 / 28 / 23 / 11mm, 13 / 22 / 28 / 22 / 11mm, 12 / 22 / 28 / 22 / 10mm, 10 / 21 / 28 / 21 / 8mm, 9 / 21 / 28 / 21 / 7mm, 8 / 21 / 28 / 21 / 5mm, so that the strip thickness reaches δ0.2mm, and the thickness tolerance is ±0.01mm; In step (6), the cold-rolled strip is degreased, cleaned, and dried, and then softened and annealed in a hydrogen protective atmosphere at 1060° C. with a strip speed of 5 m / min. In step (7), four cold rollings are performed using a twenty-high rolling mill, with 7 cold rolling passes, a single pass ≤17%, and a total pass reduction rate of 50%. The working roll diameter is Ф18.5 mm, the accuracy is ±0.002 mm, the hardness is HRC62, the front / rear tensions are 12 / 15, 12 / 12, 13 / 14, 12 / 12, 12 / 14, 12 / 12, 13 / 12 kN, respectively, and the rolling forces are 129, 173, 169, 139, 190, 109, 163 kN, respectively. The working roll type is a flat roll, and the type of an intermediate tapered roll is a flat roll body + roll end taper. The lateral pulling position of an intermediate roll and the convexity of the BC support roll are adjusted as follows: the upper roll is 20 mm away from the zero position on the operating side in the first three passes, and the lower roll is 23, 24, 25 mm away from the zero position on the transmission side, respectively. mm, the distances between the upper roller and the zero position of the operating side in the last four passes are 16, 13, 13 and 13 mm respectively, and the distances between the lower roller and the zero position of the transmission side are 20, 16, 16 and 15 mm respectively, the body length of the intermediate tapered roller is 85 mm, the taper of the roller end is 0.15 mm, and the convexity from the transmission side to the operating side 1-5# per pass is 14 / 21 / 26 / 21 / 14 mm, 14 / 21 / 26 / 21 / 14 mm, 12 / 21 / 25 / 21 / 12 mm, 11 / 21 / 25 / 21 / 11 mm, 9 / 21 / 24 / 21 / 7 mm, 6.5 / 20 / 24 / 20 / 4.7 mm, 2.2 / 19 / 25 / 19 / 1.6 mm respectively, so that the strip thickness reaches δ0.1 mm, and the thickness tolerance is ±0.005 mm. Example 3

[0034] The above elastic alloy raw material billet is used to roll a finished product with a size of δ0.05mm*335mm.

[0035] Steps (1) to (7) are the same as those in Example 2; In step (8), the thickness of the raw material strip is δ0.1 mm, the width of the raw material strip is 335 mm, the cold-rolled strip is degreased, cleaned and dried, and then softened and annealed in a hydrogen protective atmosphere at 1060° C., and the strip travel speed is 8 m / min; In step (9), five cold rollings are performed using a twenty-high rolling mill, with 7 cold rolling passes, a single pass ≤16%, a total pass reduction rate of 50%, a working roll diameter of Ф15.8mm, an accuracy of ±0.002mm, a hardness of HRC62, front / rear tensions of 7 / 9, 8 / 9, 8 / 9, 7 / 8, 6 / 7, 6 / 6, 6 / 6 kN, rolling forces of 140, 142, 160, 133, 102, 127, 115 kN, a working roll type of flat roll, an intermediate tapered roll type of flat roll body + roll end tapered; the lateral pulling position of an intermediate roll and the crown of the BC support roll are adjusted as follows: the upper roll distance from the operating side zero position of the first three passes is 22, 20, 20 mm, respectively, and the lower roll distance from the transmission side zero position is 25, 22, The strip thickness is δ0.05mm, and the thickness tolerance is ±0.002mm.

[0036] Comparative Example 1 In this comparative example, except that the number of cold rolling passes in step (1) is less than 5 times, the single pass reduction is greater than 25%, and the total pass reduction ratio is greater than 50%, the other conditions are the same as those in Example 1.

[0037] Compared with Example 1, the number of cold rolling passes is reduced, the reduction of single pass and total pass is increased, the rolling pressure is increased, the edge waves are serious, resulting in belt running, and secondly, the current of the main motor of the cold rolling mill is easily overloaded, causing damage to the machine.

[0038] Comparative Example 2 In this comparative example, except that the working roll diameter in step (9) is Φ20 mm and the accuracy is ±0.002 mm, the lateral pulling position of the intermediate roll is: the distance between the upper roll and the operating side zero position in the first three passes is >22 mm, and the distance between the lower roll and the transmission side zero position is >25 mm; the distance between the upper roll and the operating side zero position in the last four passes is >18 mm, and the distance between the lower roll and the transmission side zero position is >20 mm. The other conditions are the same as those in Example 3.

[0039] Compared with Example 3, in this comparative example, the diameter of the working roll is increased, and the thickness precision control is weakened, resulting in an increase in thickness tolerance. During the entire rolling process, the upper roll of an intermediate roll is farther from the zero position on the operating side, and the lower roll is farther from the zero position on the transmission side. The end part of the roll cannot contact the edge of the strip, resulting in serious edge waves.

[0040] Comparative Example 3 In this comparative example, except that the length of the intermediate tapered roller in step (9) is >110 mm, the convexities from the transmission side to the operating side 1-5# are >13 mm, >22 mm, >24 mm, >22 mm, and >13 mm respectively, and the other conditions are the same as those in Example 3.

[0041] Compared with Example 3, the length of the roller body of an intermediate tapered roller in this comparative example is increased, and the length of the roller end is correspondingly reduced, the contact distance between the roller end and the edge of the strip is reduced, and the edge wave adjustment type is limited. Secondly, the convexity increases accordingly from the transmission side to the operating side 1-5#, and a wave shape is generated in the middle and 1 / 4 of the strip.

[0042] Table 3. Differences in dimensional accuracy, plate quality, room temperature mechanical properties, etc. of the strip products obtained from the embodiments of the present invention and the comparative examples

Claims

1. A method for rolling an elastic alloy strip foil for a sensor, characterized in that: The raw material billet with a diameter of δ1.5~2.0mm is cold rolled for ≥3 times, and intermediate softening annealing is required after each cold rolling. By controlling the pressing rolling force and rolling tension, adjusting the lateral pulling position of an intermediate roller and the crown of the supporting roller, the billet is rolled into a cold-rolled alloy strip foil with a thickness of δ0.05~0.3mm, a width greater than 300mm, a thickness accuracy tolerance of ±3μm, and an unevenness of 1mm / twice the width.

2. The rolling method according to claim 1, characterized in that: The first cold rolling adopts a two-roll, four-roll or six-roll rolling mill, the number of cold rolling passes is at least 5 times, the single pass is ≤25%, the total pass reduction rate is 32% to 50%, and the strip thickness is δ1.0mm.

3. The rolling method according to claim 1, characterized in that: Secondary cold rolling, using a twenty-high rolling mill, the number of cold rolling passes is at least 5 times, the single pass is ≤15%, the total pass reduction rate is 32% to 50%, the working roll diameter is Ф23-27mm, the accuracy is ±0.002mm, the hardness is HRC61~63, the tension adjustment range is 30-50kN, the rolling force adjustment range is 250-400kN, and the intermediate tapered roll type is a flat roll + roll end taper, so that the strip thickness is δ0.5mm; Preferably, the lateral twitching position of the intermediate tapered roller is: the upper roller of the first four passes is 30-40 mm away from the zero position on the operating side, and the lower roller is 35-47 mm away from the zero position on the transmission side; the upper roller of the last four passes is 15-30 mm away from the zero position on the operating side, and the lower roller is 18-35 mm away from the zero position on the transmission side; Preferably, the roller body length of the intermediate tapered roller is 85-110 mm, the roller end taper is 0.1-0.2 mm, and the convexity from the transmission side to the operating side 1-5# is 10-15 mm, 19-23 mm, 27-28 mm, 19-23 mm, and 10-15 mm respectively.

4. The rolling method according to claim 1, characterized in that: Three times cold rolling, using a twenty-high rolling mill, the number of cold rolling passes is at least 5 times, the single pass is ≤17%, the total pass reduction rate is 40% to 60%, the working roll diameter is Ф20-26mm, the accuracy is ±0.002mm, the hardness is HRC61~63, the tension adjustment range is 20-35kN, the rolling force adjustment range is 200-300kN, the working roll type is a flat roll, and the middle tapered roll type is a flat roll body + roll end taper, so that the strip thickness is δ0.2~0.3mm; Preferably, the lateral twitching position of the intermediate tapered roller is: the upper roller is 20-25mm away from the zero position on the operating side in the first four passes, and the lower roller is 25-30mm away from the zero position on the transmission side; the upper roller is 15-23mm away from the zero position on the operating side in the last four passes, and the lower roller is 17-25mm away from the zero position on the transmission side; Preferably, the roller body length of the intermediate tapered roller is 85-110 mm, and the roller end taper is 0.1-0.2 mm; the convexity from the transmission side to the operating side 1-5# is 8-16 mm, 21-24 mm, 25-28 mm, 21-24 mm, and 5-16 mm respectively.

5. The rolling method according to claim 1, characterized in that: If the thickness of the strip to be rolled is less than δ0.2-0.3 mm, four cold rollings are required, and the strip obtained after three cold rollings is subjected to intermediate softening annealing before cold rolling; Preferably, the intermediate softening annealing method is: after the cold-rolled strip is degreased, cleaned and dried, the strip is softened and annealed at a speed of 5.0-7.0 m / min in a hydrogen protective atmosphere at 1020-1060°C to ensure that the hardness value of the strip foil is HV<240.

6. The rolling method according to claim 5, characterized in that: The four cold rollings are performed by a twenty-high rolling mill, with at least five cold rolling passes, a single pass ≤17%, and a total pass reduction rate of 50% to 65%. The working roll diameter is Φ18-20mm, the precision is ±0.002mm, the hardness is HRC61-63, the tension adjustment range is 10-15kN, the rolling force adjustment range is 100-200kN, the working roll type is a flat roll, and the middle tapered roll type is a flat roll body + roll end taper, so that the strip thickness is δ0.1-0.15mm; Preferably, the lateral twitching position of the intermediate tapered roller is: the upper roller is 18-20mm away from the zero position on the operating side in the first three passes, and the lower roller is 20-25mm away from the zero position on the transmission side; the upper roller is 10-18mm away from the zero position on the operating side in the last four passes, and the lower roller is 15-20mm away from the zero position on the transmission side; Preferably, the roller body length of the intermediate tapered roller is 85-110 mm, the roller end taper is 0.1-0.2 mm, and the convexity from the transmission side to the operating side 1-5# is 2-14 mm, 19-21 mm, 24-26 mm, 19-21 mm, and 1-14 mm respectively.

7. The rolling method according to claim 1, characterized in that: If the thickness of the strip to be rolled is less than δ0.1~0.15mm, five cold rollings are required, and the strip obtained after four cold rollings is subjected to intermediate softening annealing before cold rolling; Preferably, the intermediate softening annealing method is: after the cold-rolled strip is degreased, cleaned and dried, the strip is softened and annealed at a speed of 7.0-10.0 m / min in a hydrogen protective atmosphere at 1020-1060° C. to ensure that the hardness value of the strip foil is HV<240.

8. The rolling method according to claim 7, characterized in that: The five cold rollings are performed by a twenty-high rolling mill, the number of cold rolling passes is at least 5, the single pass is ≤16%, the total pass reduction rate is 45% to 65%, the working roll diameter is Ф15-18mm, the accuracy is ±0.002mm, the hardness is HRC61-63, the tension adjustment range is 5-10kN, the rolling force adjustment range is 100-200kN, the working roll type is a flat roll, and the middle tapered roll type is a flat roll body + roll end taper, so that the strip thickness is δ0.05-0.08mm; Preferably, the lateral twitching position of the intermediate tapered roller is: the upper roller is 18-22 mm away from the zero position on the operating side in the first three passes, and the lower roller is 20-25 mm away from the zero position on the transmission side; the upper roller is 8-18 mm away from the zero position on the operating side in the last four passes, and the lower roller is 12-20 mm away from the zero position on the transmission side; Preferably, the roller body length of the intermediate tapered roller is 85-110 mm, the roller end taper is 0.1-0.2 mm, and the convexity from the transmission side to the operating side 1-5# is 2-13 mm, 20-22 mm, 21-24 mm, 16-22 mm, and 2-13 mm respectively.

9. The rolling method according to claim 1, characterized in that: The intermediate softening annealing method: after the cold-rolled strip is degreased, cleaned and dried, it is softened and annealed in a hydrogen protective atmosphere at 1020-1060°C, and the strip speed of each softening annealing is controlled to ensure that the hardness value of the strip foil is HV<240; Preferably, the conveyor speed of the primary intermediate softening annealing is 0.5-2.0 m / min; the conveyor speed of the secondary intermediate softening annealing is 2.0-5.0 m / min.

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