Rolling method for elastic alloy strip foil for sensors

Abstract

This invention relates to a rolling method for elastic alloy strip foil for sensors. The method employs multiple cold rolling processes combined with intermediate softening annealing. By controlling the rolling force and tension, adjusting the lateral movement position of an intermediate roll, and the crown of the support roll, a cold-rolled elastic alloy strip foil product with a thickness of δ 0.05~0.3mm, a width greater than 300mm, a thickness accuracy tolerance of ±3μm, a bright and clean surface free from defects such as scratches, folds, peeling, pits, pitting, and oxidation, and an unevenness of 1mm / twice the width is obtained. This invention solves the problems of easy strip breakage, poor sheet shape, and large edge waviness during cold rolling. The product has high production efficiency and good quality, and can meet the needs of wide, ultra-thin, and high-scale quality elastic alloy strip foil for the preparation of high-precision sensor diaphragms in aerospace, automotive, communications and consumer electronics, nuclear power, and petrochemical fields.

Description

TECHNICAL FIELD

[0001] The present application belongs to the field of elastic alloy materials, and particularly relates to a precision rolling method of an elastic alloy strip foil with wide width, high precision and plate shape quality for a sensor. BACKGROUND

[0002] As the "senses" and "nerves" of a spacecraft, sensors are distributed in various key parts of the spacecraft, are located at the forefront of information collection, and are usually used in extremely harsh environments such as ultra-low temperature, strong radiation, high vacuum and high speed. The sensors are effective means to ensure accurate measurement, accurate prediction and high diagnosis, and to guarantee the success rate of a task. Since the measurement of a pressure sensor will drift with changes in the working environment and static pressure, accurate and stable measurement of the pressure value in the working temperature range is required to reduce the generation of drift. Due to the particularity of the on-orbit environment of the spacecraft, the measurement accuracy of the sensor is out of tolerance or fails, which may directly lead to a failure of orbit change and other accidents. Therefore, the sensor plays a key role in ensuring the safety of astronauts and the normal operation of the spacecraft.

[0003] The detection accuracy of a diaphragm type pressure sensor is closely related to the material properties, structural design, welding process and other factors. The metal diaphragm material is a key material for the pressure sensor to feedback the pressure value, and has a great advantage in sensitivity. The material, limit thickness, width, dimensional accuracy and uniformity, surface and plate shape quality, mechanical properties and the like are closely related to the measurement accuracy. Many elastic sensitive metal materials such as beryllium bronze, tin bronze and stainless steel (1Cr18Ni9Ti) have deficiencies in load capacity and anti-interference ability, which affects the detection performance of the sensor output itself. The elastic alloy strip foil has the characteristics of simple structure, good dynamic response, good temperature stability, stable elasticity and mechanical properties, extremely low elastic aftereffect and corrosion resistance, and is a key basic material required for a space pressure sensor.

[0004] With the rapid development of aerospace technology, the stability and measurement accuracy of pressure sensors are increasingly required. The performance requirements of elastic alloy strip foils for preparing sensors are: thickness δ 0.05-0.3 mm, width greater than 300 mm, thickness precision tolerance ±3 μm, same plate difference ≤1.5 μm, surface roughness Ra ≤0.2 μm, unevenness up to 1 mm / two times width. Due to the difference between the organizational structure of elastic alloy and other types of alloy materials, mainly in: (1) simple structure, few strengthening phases, stable phase structure; (2) few defects, easy to deform, easy to control segregation, uniform element distribution, few defect structures such as dislocation, vacancy and grain boundary, small deformation resistance and slow work hardening rate during cold deformation; (3) many slip systems, small anisotropy degree, easy dislocation slip, showing isotropy. In the rolling deformation process, especially the strip foils with large width-thickness ratio are obviously affected by grain, texture, surface morphology and transient temperature, and there is a local instability phenomenon. The rolling method plays a very important role in improving the size accuracy and flatness quality of the strip foils.

[0005] After searching, invention patent 1: A high magnetic induction non-oriented high silicon steel ultra-thin strip and its preparation and application (publication number: CN118895412 A), adopts warm rolling + cold rolling mode, through controlling annealing temperature, warm rolling temperature, pass number and reduction rate, etc. Ways to obtain thickness ≤0.1mm high magnetic induction non-oriented high silicon steel. But the material of this technology is different, and the focus is on the limit thickness and magnetic performance, and the control of size accuracy and flatness quality is not described. Invention patent 2: Rolling method of ultra-thin wide high-grade non-oriented silicon steel and produced non-oriented silicon steel (patent number: CN 118663692 A), adopts multiple cold rolling mode, through controlling reduction distribution, tension control, roll ratio, emulsion system parameters, control mode adjustment, etc. Ways to obtain thickness ≤0.1mm, width more than 1000mm high-grade non-oriented silicon steel. But the material of this technology is different, and the focus is on the limit thickness, width and flatness quality, and the control of size accuracy is not described. Invention patent 3: Preparation method of high-purity nickel strip foil for electronic industry (publication number: CN 111118304 A), adopts vacuum induction melting (VIM) and protective atmosphere electroslag remelting (PESR) double melting method to improve the surface quality and internal metallurgical quality of nickel strip foil. But the material of this technology is different, and the control of limit size, size accuracy and flatness quality is not described. Invention patent 4: Rolling method of wide metal strip foil (publication number: WO 2022 / 217717 A1), adopts rolling mill with unequal diameter work rolls to roll the strip foil to obtain wider, thinner and more ideal flatness strip foil. This technology involves special tooling and method. Patent 5: Iron-nickel-based superalloy, ultra-thin strip foil and preparation method (publication number: CN 116590576 A), for a kind of iron-nickel-based superalloy material, adopts VIM + electroslag remelting (ESR) double melting process, and obtains strip foil with thickness δ ≤0.01mm through multiple cold rolling. But the material of this technology is different, and the control of size accuracy and flatness quality is not described. Patent 6: Low residual stress nickel-based superalloy foil and its preparation method and application (publication number: CN 117587298B), for a kind of iron-nickel-based superalloy material, through component design, by controlling multiple refining temperature, pouring temperature and stress annealing temperature, etc. Ways to prepare low residual stress nickel-based superalloy foil with thickness δ 0.03~0.15mm. But the material of this technology is different, and the control of size accuracy and flatness quality is not described.

[0006] At present, in the precision rolling method of elastic alloy strip foil, how to control the incoming state of the blank, adopt twenty-roll precision rolling mill, develop reasonable rolling process, obtain limit thickness, width, size accuracy, size uniformity, surface and flatness quality, etc. Indexes of elastic alloy precision strip foil reaching international advanced level is the problem to be solved at present. SUMMARY

[0007] In order to solve the above problems, the application provides a rolling method of an elastic alloy strip foil for sensors. The method can effectively prepare a wide, ultra-thin, high surface quality elastic alloy strip foil with high precision, size uniformity, surface and shape quality, which meets the requirements of high-precision sensor membranes in the fields of aerospace, automobiles, communication and consumer electronic products, nuclear power and petrochemical industry.

[0008] The technical scheme of the application is as follows:

[0009] The rolling method of the elastic alloy strip foil for sensors is as follows: a δ1.5-2.0 mm raw material blank is rolled through ≥3 times of cold rolling, and intermediate softening annealing is required after each cold rolling; the alloy strip foil with a thickness of δ0.05-0.3 mm, a width greater than 300 mm, a thickness precision tolerance of ±3 μm and a flatness of 1 mm / twice the width is rolled by controlling the rolling force, the rolling tension, adjusting the transverse position of a middle roller and the crown of a supporting roller.

[0010] In the above first cold rolling, a two-roller, four-roller or six-roller rolling mill is used, the cold rolling pass number is at least 5, the single pass is ≤25%, and the total pass reduction rate is 32%-50%, so that the strip thickness is δ1.0 mm and the thickness tolerance is ±0.03 mm.

[0011] In the above second cold rolling, a twenty-roller rolling mill is used, the cold rolling pass number is at least 5, the single pass is ≤15%, and the total pass reduction rate is 32%-50%, the working roller diameter is Ф23-27 mm, the precision is ±0.002 mm, the hardness is HRC61-63, the tension adjustment range is 30-50 kN, the rolling force adjustment range is 250-400 kN, the middle taper roller type is a flat roller body+roller end taper, the strip thickness is δ0.5 mm, and the thickness tolerance is ±0.02 mm.

[0012] Preferably, the transverse position of the middle taper roller is as follows: the upper roller distance from the operation side zero position is 30-40 mm, and the lower roller distance from the transmission side zero position is 35-47 mm in the first four passes; and the upper roller distance from the operation side zero position is 15-30 mm, and the lower roller distance from the transmission side zero position is 18-35 mm in the last four passes.

[0013] Preferably, the length of the middle taper roller body is 85-110 mm, the roller end taper is 0.1-0.2 mm, and the crown from the transmission side to the operation side is 10-15 mm, 19-23 mm, 27-28 mm, 19-23 mm and 10-15 mm in sequence.

[0014] The three cold rolling is performed by a twenty-roller rolling mill, the cold rolling pass number is at least 5, the single pass is ≤17%, the total pass reduction is 40%-60%, the working roller 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 roller type is flat roller, the one intermediate taper roller type is flat roller body+roller end taper, the strip thickness is δ0.2-δ0.3mm, and the thickness tolerance is ±0.01mm;

[0015] Preferably, the one intermediate taper roller transverse jerk position is: the upper roller distance from the operation side zero position is 20-25mm, and the lower roller distance from the transmission side zero position is 25-30mm in the first four passes; the upper roller distance from the operation side zero position is 15-23mm, and the lower roller distance from the transmission side zero position is 17-25mm in the last four passes.

[0016] Preferably, the one intermediate taper roller body length is 85-110mm, and the roller end taper is 0.1-0.2mm; the crown is 8-16mm, 21-24mm, 25-28mm, 21-24mm, and 5-16mm from the transmission side to the operation side in sequence.

[0017] If the strip foil thickness to be rolled is less than δ0.3mm, four or five cold rolling is needed.

[0018] If the strip thickness to be rolled is less than δ0.2-0.3mm, four cold rolling is needed, and the strip obtained after three cold rolling is subjected to intermediate softening annealing before cold rolling.

[0019] Preferably, the intermediate softening annealing method is: after the strip after cold rolling is degreased, cleaned and dried, it is subjected to softening annealing treatment in a hydrogen protection atmosphere at 1020-1060℃, the softening annealing strip running speed is controlled to be 5.0-7.0m / min, so as to ensure that the strip foil hardness value HV is less than 240. The four cold rolling is performed by a twenty-roller rolling mill, the cold rolling pass number is at least 5, the single pass is ≤17%, the total pass reduction is 50%-65%, the working roller diameter is Ф18-20mm, 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 roller type is flat roller, the one intermediate taper roller type is flat roller body+roller end taper, the strip thickness is δ0.1-0.15mm, and the thickness tolerance is ±0.005mm.

[0020] Preferably, the one intermediate taper roller transverse jerk position is: the upper roller distance from the operation side zero position is 18-20mm, and the lower roller distance from the transmission side zero position is 20-25mm in the first three passes; the upper roller distance from the operation side zero position is 10-18mm, and the lower roller distance from the transmission side zero position is 15-20mm in the last four passes.

[0021] Preferably, the intermediate taper roller body length is 85-110mm, the roller end taper is 0.1-0.2mm, and the convexity from the driving side to the operating side 1-5# is 2-14mm, 19-21mm, 24-26mm, 19-21mm, 1-14mm, respectively.

[0022] If the thickness of the strip to be rolled is less than δ0.1~0.15mm, five cold rolling is needed, and the strip obtained after four cold rolling is subjected to intermediate softening annealing before cold rolling;

[0023] Preferably, the intermediate softening annealing method is: after the cold-rolled strip is degreased, cleaned and dried, it is subjected to softening annealing treatment in a hydrogen protective atmosphere at 1020~1060℃, and the walking speed of softening annealing is controlled to be 7.0~10.0m / min to ensure that the hardness value HV of the strip foil is less than 240.

[0024] The five cold rolling is carried out by using a twenty-roll rolling mill, the cold rolling pass number is at least 5, the single pass is ≤16%, the total pass reduction rate is 45%~65%, the working roller 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 roller type is flat roller, the intermediate taper roller type is roller body flat roller+roller end taper, so that the strip thickness is δ0.05~0.08mm, and the thickness tolerance is ±0.002mm;

[0025] Preferably, the intermediate taper roller transverse twitching position is: the upper roller distance from the operating side zero position is 18-22mm, and the lower roller distance from the driving side zero position is 20-25mm in the first three passes, and the upper roller distance from the operating side zero position is 8-18mm, and the lower roller distance from the driving side zero position is 12-20mm in the last four passes.

[0026] Preferably, the intermediate taper roller body length is 85-110mm, the roller end taper is 0.1-0.2mm, and the convexity from the driving side to the operating side 1-5# is 2-13mm, 20-22mm, 21-24mm, 16-22mm, 2-13mm, respectively.

[0027] The intermediate softening annealing method is: after the cold-rolled strip is degreased, cleaned and dried, it is subjected to softening annealing treatment in a hydrogen protective atmosphere at 1020~1060℃, and the walking speed of softening annealing is controlled to ensure that the hardness value HV of the strip foil is less than 240;

[0028] Preferably, the strip speed of the once intermediate softening annealing is 0.5-2.0 m / min; the strip speed of the twice intermediate softening annealing is 2.0-5.0 m / min; the strip speed of the thrice intermediate softening annealing is 5.0-7.0 m / min; and the strip speed of the four times intermediate softening annealing is 7.0-10.0 m / min.

[0029] The weight percentage of each component of the elastic alloy raw material blank is: 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%; and the balance is Fe and impurities, wherein the total amount of impurities is ≤0.04%.

[0030] The impurities are S, P, Cu, O, N, and H, and the weight percentage of each is: S ≤0.01%; P ≤0.015%; Cu ≤0.01%; O ≤0.0020%; N ≤0.0050%; and H ≤0.0001%.

[0031] The content of A, B, and C type (coarse and fine) non-metallic inclusions in the blank is ≤1.0, the content of D (coarse and fine) non-metallic inclusions is ≤1.5, and the total content of non-metallic inclusions is not more than 1.5 levels.

[0032] The thickness of the blank is δ1.5-2.0 mm, the width is 320-360 mm, the thickness precision tolerance is ±0.05 mm, the surface roughness Ra is ≤1.0 μm, the hardness is ≤260 HV, there is no camber, the surface is bright and clean, and there are no defects such as scratches, folds, peeling, pits, pitting, oxidation color, etc.

[0033] The beneficial effects of the present application are:

[0034] 1) The present application is a kind of sensor with elastic alloy strip foil precision rolling method, adopt multiple cold rolling method combination intermediate softening annealing process, twenty roller mill does not need to increase the premise of equipping plate shape tester and control module, through distribution reduction, tension control, adjust a intermediate roll transverse twitch position and BC support roll convexity etc., realize the production of elastic alloy strip foil product, thickness is δ0.05-0.3mm, width is greater than 300mm, thickness precision tolerance is ±3 μm, surface is bright and clean, there are no scratches, folds, peeling, pits, pitting, oxidation color, etc.

[0035] 2) The production method described above meets the high-quality requirements of wide, ultra-thin, high-scale quality elastic alloy strips and foils for the preparation of high-precision sensor diaphragms in aerospace, automotive, communications and consumer electronics, nuclear power and petrochemical fields. Attached Figure Description

[0036] Figure 1 A schematic flowchart illustrating the rolling method for wide, ultra-thin, high-scale elastic alloy strip and foil provided by the present invention.

[0037] Figure 2 The typical cold-rolled strip and foil dimensions and tolerances (thickness δ0.05mm, width 335mm) obtained by manufacturing according to the above scheme are shown.

[0038] Figure 3 The surface quality of a typical cold-rolled strip and foil material (with a thickness of δ0.05 mm and a width of 335 mm) obtained by manufacturing according to the above scheme.

[0039] Figure 4 The unevenness of a typical cold-rolled strip foil material (with a thickness of δ0.05 mm and a width of 335 mm) obtained by manufacturing according to the above scheme. Detailed Implementation

[0040] The specific embodiments of the present invention will be further described in detail below with reference to the accompanying drawings. The production method includes the following steps:

[0041] The raw material used is an elastic alloy, the composition of which is shown in Table 1.

[0042] Table 1. Composition of elastic alloy raw material billet (wt%)

[0043]

[0044] Table 2 Specifications and properties of elastic alloy raw material billets

[0045]

[0046] The material described in this invention is prepared by the following method: See [link to documentation]. Figures 1-4 Example 1

[0047] Using the above-mentioned elastic alloy raw material billet, a finished product with a diameter of δ0.3mm and a diameter of 335mm is rolled.

[0048] Step (1) Cold rolling is performed once using a four-roll cold rolling mill with 8 cold rolling passes, each pass having a reduction rate of ≤25%, and the total pass reduction rate being 50%, so that the strip thickness reaches δ1.0mm and the thickness tolerance is ±0.03mm.

[0049] Step (2), secondary cold rolling: After degreasing, cleaning and drying, the cold-rolled strip is softened and annealed in a hydrogen protective atmosphere at 1060℃, with a belt speed of 0.8m / min and a hardness value of 230. <HV<240;

[0050] Step (3), secondary cold rolling, using a 20-roll mill, 8 cold rolling passes, single pass ≤15%, total pass reduction rate 50%, the work roll diameter is Ф25.7mm, accuracy ±0.002mm, hardness HRC62, front / back tensions are 44 / 42, 45 / 44, 50 / 47, 47 / 48, 46 / 47, 44 / 40, 36 / 41, 34 / 32kN respectively, rolling forces are 290, 390, 320, 337, 365, 293, 348, 340kN respectively, the work roll type is flat roll, the intermediate tapered roll type is roll body flat roll + roll end tapered, the lateral pull position of the intermediate roll and the convexity of the BC support roll are adjusted as follows: the distance of the upper roll from the zero position on the operating side for the first four passes is 40, 40, 31, 30mm respectively, and the distance of the lower roll from the zero position on the transmission side is 46, 47 The distances of the upper roller from the zero position on the operating side for the last four passes are 22, 26, 17, and 17 mm respectively, and the distances of the lower roller from the zero position on the transmission side are 25, 21, 19, and 19 mm respectively. The length of the intermediate tapered roller is 110 mm, and the tapered end is 0.18 mm. The convexity from the transmission side to the operating side for passes 1-5# is 15 / 23 / 28 / 23 / 15 mm, 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; to achieve a strip thickness of δ0.5mm, with a thickness tolerance of ±0.02mm;

[0051] Step (4): After degreasing, cleaning and drying, the cold-rolled strip is softened and annealed in a hydrogen protective atmosphere at 1060℃ with a belt speed of 3m / min.

[0052] In step (5), three cold rolling processes are performed using a 20-roll mill. The number of cold rolling passes is 8, with a single pass reduction of ≤17% and a total pass reduction rate of 40%. The work roll diameter is Ф25.2mm, accuracy is ±0.002mm, hardness is HRC62, and the front / back tensions are 30 / 35, 29 / 34, 28 / 34, 29 / 29, 29 / 28, 27 / 26, 25 / 25, and 24 / 24kN respectively. The rolling forces are 250, 268, 294, 292, 243, 235, 210, and 210kN respectively. The work roll type is a flat roll, and the intermediate tapered roll type is a flat roll body + tapered roll end. The lateral movement position of the intermediate roll and the convexity of the BC support roll are adjusted as follows: for the first four passes, the distance of the upper roll from the zero position on the operating side is 25, 24, 22, and 20mm respectively, and the distance of the lower roll from the zero position on the transmission side is 28mm respectively. The distances from the upper roller to the zero position on the operating side are 20, 18, 18, and 16 mm respectively for the last four passes, and 24, 22, 20, and 18 mm respectively for the lower roller to the zero position on the transmission side. The length of the intermediate tapered roller is 110 mm, and the tapered end is 0.18 mm. The convexity from the transmission side to the operating side for passes 1-5 is 16 / 24 / 28 / 24 / 16 mm respectively. 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, to achieve a strip thickness of δ0.3mm and a thickness tolerance of ±0.01mm. Example 2

[0053] Using the above-mentioned elastic alloy raw material billet, a finished product with a diameter of δ0.1mm and a diameter of 335mm is rolled.

[0054] Steps (1) to (4) are the same as in Example 1;

[0055] Step (5): Three rolling processes are performed using a 20-roll mill. The number of cold rolling passes is 8, with a single pass reduction of ≤17% and a total pass reduction rate of 50%. The work roll diameter is Ф20.8mm, accuracy is ±0.002mm, and hardness is HRC62. The front / back tensions are 29 / 34, 30 / 34, 32 / 34, 29 / 29, 29 / 28, 24 / 25, 21 / 23, and 20 / 21kN, respectively. The rolling forces are 218, 272, 297, 287, 237, 245, 263, and 237kN, respectively. The work roll type is a flat roll, and the intermediate tapered roll type is a flat roll body + tapered roll end. The lateral movement position of the intermediate roll and the convexity of the BC support roll are adjusted as follows: the distance from the upper roll to the zero position on the operating side for the first four passes is 23, 23, 22, and 22mm, respectively; the distance from the lower roll to the zero position on the transmission side is 29 and 27mm, respectively. The distances of the upper rollers from the zero position on the operating side to the zero position of the lower rollers are 23, 22, 20, and 16 mm respectively, and the distances of the lower rollers from the zero position on the transmission side are 22, 21, 19, and 17 mm respectively. The length of the intermediate tapered roller is 110 mm, and the tapering at the roller end is 0.18 mm. The convexity from the transmission side to the operating side for each of the 1-5# passes is 15 / 23 / 28 / 23 / 15 mm, 15 / 23 / 28 / 23 / 15 mm, 13 / 23 / 28 / 23 / 11 mm, 13 / 22 / 28 / 22 / 11 mm, 12 / 22 / 28 / 22 / 10 mm, 10 / 21 / 28 / 21 / 8 mm, 9 / 21 / 28 / 21 / 7 mm, and 8 / 21 / 28 / 21 / 5 mm, so that the strip thickness reaches δ0.2 mm and the thickness tolerance is ±0.01 mm.

[0056] In step (6), after the cold-rolled strip is degreased, cleaned and dried, it is softened and annealed in a hydrogen protective atmosphere at 1060℃, and the belt speed is 5m / min.

[0057] In step (7), four cold rolling passes are performed using a 20-roll mill, with 7 cold rolling passes, a single pass rate of ≤17%, and a total pass reduction rate of 50%. The work roll diameter is Ф18.5mm, accuracy is ±0.002mm, hardness is HRC62, and the front / back tensions are 12 / 15, 12 / 12, 13 / 14, 12 / 12, 12 / 14, 12 / 12, 13 / 12 kN, respectively. The rolling forces are 129, 173, 169, 139, 190, 109, 163 kN, respectively. The work roll type is a flat roll, and the intermediate tapered roll type is a flat roll body + tapered roll end. The lateral movement position of the intermediate roll and the convexity of the BC support roll are adjusted as follows: for the first three passes, the upper roll is 20mm from the zero position on the operating side, and the lower roll is 23, 24, and 25mm from the zero position on the transmission side, respectively. mm, the distances of the upper roller from the zero position on the operating side for the last four passes are 16, 13, 13, and 13 mm respectively, and the distances of the lower roller from the zero position on the transmission side are 20, 16, 16, and 15 mm respectively. The length of the intermediate tapered roller is 85 mm, and the tapering at the roller end is 0.15 mm. The convexity from the transmission side to the operating side for each pass (1-5#) 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, and 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

[0058] Using the above-mentioned elastic alloy raw material billet, a finished product with a diameter of δ0.05mm*335mm is rolled.

[0059] Steps (1) to (7) are the same as in Example 2;

[0060] In step (8), the thickness of the raw material strip is δ0.1mm, the width of the raw material strip is 335mm, and after the cold-rolled strip is degreased, cleaned and dried, it is softened and annealed in a hydrogen protective atmosphere at 1060℃. The belt speed is 8m / min.

[0061] In step (9), five cold rolling passes are performed using a 20-roll mill. The number of cold rolling passes is 7, with a single pass reduction of ≤16% and a total pass reduction rate of 50%. The work roll diameter is Ф15.8mm, accuracy is ±0.002mm, hardness is HRC62, and the front / back tensions are 7 / 9, 8 / 9, 8 / 9, 7 / 8, 6 / 7, 6 / 6, and 6 / 6 kN respectively. The rolling forces are 140, 142, 160, 133, 102, 127, and 115 kN respectively. The work roll type is flat roll, and the intermediate tapered roll type is a flat roll body + tapered roll end. The lateral movement position of the intermediate roll and the convexity of the BC support roll are adjusted as follows: for the first three passes, the distance of the upper roll from the zero position on the operating side is 22, 20, and 20mm respectively, and the distance of the lower roll from the zero position on the transmission side is 25 and 22mm respectively. The strip thickness is 20mm. The distances of the upper roller from the zero position on the operating side for the last four passes are 13mm, 10mm, 10mm, and 8mm respectively, and the distances of the lower roller from the zero position on the transmission side are 15mm, 15mm, 15mm, and 12mm respectively. The length of the intermediate tapered roller is 85mm, and the tapering at the roller end is 0.15mm. The convexity from the transmission side to the operating side for each pass (1-5#) is 13 / 22 / 24 / 22 / 13mm, 13 / 22 / 24 / 22 / 13mm, 10 / 21 / 23 / 21 / 10mm, 7 / 21 / 22 / 21 / 7mm, 7 / 20 / 21 / 16 / 2mm, 2 / 20 / 22 / 20 / 4mm, and 2 / 20 / 22 / 20 / 4mm respectively, so that the strip thickness reaches δ0.05mm and the thickness tolerance is ±0.002mm.

[0062] Comparative Example 1

[0063] Except for step (1), where the number of cold rolling passes is less than 5, the single pass rate is >25%, and the total pass reduction rate is >50%, all other conditions in this comparative example are the same as in Example 1.

[0064] Compared with Example 1, this comparative example has a reduced number of cold rolling passes, an increased reduction per pass and in total passes, an increased rolling pressure, severe edge waviness, which leads to belt slippage. Furthermore, the main motor current of the cold rolling mill is prone to overload, causing machine damage.

[0065] Comparative Example 2

[0066] In this comparative example, except that the working roller diameter in step (9) is Ф20mm and the accuracy is ±0.002mm, the lateral movement position of the intermediate roller is as follows: for the first three passes, the distance between the upper roller and the zero position on the operating side is >22mm, and the distance between the lower roller and the zero position on the transmission side is >25mm; for the last four passes, the distance between the upper roller and the zero position on the operating side is >18mm, and the distance between the lower roller and the zero position on the transmission side is >20mm. All other conditions are the same as in Example 3.

[0067] Compared with Example 3, the working roll diameter of this comparative example is increased, the thickness accuracy control is weakened, resulting in an increase in thickness tolerance. Throughout the 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 roll end cannot contact the edge of the strip, resulting in severe edge waviness.

[0068] Comparative Example 3

[0069] In this comparative example, except that the length of the intermediate tapered roller body in step (9) is >110mm, and the convexity from the transmission side to the operation side 1-5# is >13mm, >22mm, >24mm, >22mm, >13mm respectively, all other conditions are the same as in Example 3.

[0070] Compared with Example 3, this comparative example shows that the length of the intermediate tapered roller body is increased, the roller end length is correspondingly reduced, the contact distance between the roller end and the edge of the strip is reduced, the edge waviness adjustment type is limited, and the convexity from the drive side to the operating side 1-5# is correspondingly increased, resulting in waviness in the middle and 1 / 4 of the strip.

[0071] Table 3. Differences in dimensional accuracy, sheet quality, and room temperature mechanical properties between the strip products obtained in the embodiments and comparative examples of the present invention.

[0072]

Claims

1. A rolling method of an elastic alloy strip foil for a sensor, characterized by, The δ1.5-2.0 mm raw material blank is cold-rolled for ≥3 times, and intermediate softening annealing is needed after each cold rolling, and the cold-rolled alloy strip foil material with a thickness of δ0.05-0.3 mm, a width of greater than 300 mm, a thickness precision tolerance of ±3 μm and a flatness of 1 mm / twice the width is obtained by controlling the rolling force, the rolling tension, adjusting the lateral pulling position of the intermediate taper roller and the crown of the supporting roller; The one-time cold rolling is performed by using a two-roll, four-roll or six-roll rolling mill, the cold rolling pass number is at least 5, the single pass reduction rate is ≤25%, and the total pass reduction rate is 32%-50%, so that the strip thickness is δ1.0 mm; The two-time cold rolling is performed by using a twenty-roll rolling mill, the cold rolling pass number is at least 5, the single pass reduction rate is ≤15%, the total pass reduction rate is 32%-50%, the working roller diameter is Ф23-27 mm, the precision is ±0.002 mm, the hardness is HRC61-63, the tension adjustment range is 30-50 kN, the rolling force adjustment range is 250-400 kN, the intermediate taper roller type is a roller body flat roller + roller end taper, and the strip thickness is δ0.5 mm; The lateral pulling position of the intermediate taper roller is that the upper roller distance from the operation side zero position is 30-40 mm, the lower roller distance from the transmission side zero position is 35-47 mm in the first four passes, and the upper roller distance from the operation side zero position is 15-30 mm, the lower roller distance from the transmission side zero position is 18-35 mm in the last four passes; The roller body length of the intermediate taper roller is 85-110 mm, the roller end taper is 0.1-0.2 mm, and the crown from the transmission side to the operation side is 10-15 mm, 19-23 mm, 27-28 mm, 19-23 mm and 10-15 mm in sequence from 1# to 5#; The three-time cold rolling is performed by using a twenty-roll rolling mill, the cold rolling pass number is at least 5, the single pass reduction rate is ≤17%, the total pass reduction rate is 40%-60%, the working roller diameter is Ф20-26 mm, the precision is ±0.002 mm, the hardness is HRC61-63, the tension adjustment range is 20-35 kN, the rolling force adjustment range is 200-300 kN, the working roller type is a flat roller, the intermediate taper roller type is a roller body flat roller + roller end taper, and the strip thickness is δ0.2-0.3 mm; The lateral pulling position of the intermediate taper roller is that the upper roller distance from the operation side zero position is 20-25 mm, the lower roller distance from the transmission side zero position is 25-30 mm in the first four passes, and the upper roller distance from the operation side zero position is 15-23 mm, the lower roller distance from the transmission side zero position is 17-25 mm in the last four passes; The roller body length of the intermediate taper roller is 85-110 mm, the roller end taper is 0.1-0.2 mm, and the crown from the transmission side to the operation side is 8-16 mm, 21-24 mm, 25-28 mm, 21-24 mm and 5-16 mm in sequence from 1# to 5#.

2. The rolling method according to claim 1, characterized in that, If the strip thickness to be rolled is less than δ0.2 mm, four-time cold rolling is needed, and the strip obtained after the three-time cold rolling is subjected to intermediate softening annealing before cold rolling.

3. The rolling method according to claim 2, characterized in that The intermediate softening annealing method is as follows: after the cold-rolled strip is degreased, cleaned and dried, the strip is controlled to have a softening annealing speed of 5.0-7.0 m / min in a hydrogen protection atmosphere at 1020-1060 ℃, so as to ensure that the hardness value HV of the strip is less than 240.

4. The rolling method according to claim 2, characterized in that The four times of cold rolling are performed by using a twenty-roller rolling machine, the single pass reduction rate is less than or equal to 17%, the total pass reduction rate is 50%-65%, the working roller diameter is Ф18-20 mm, the precision is ±0.002 mm, the hardness is HRC 61-63, the tension adjustment range is 10-15 kN, the rolling force adjustment range is 100-200 kN, the working roller type is a flat roller, the intermediate taper roller type is a flat roller body+roller end taper, and the strip thickness is δ0.1-0.15 mm.

5. The rolling method according to claim 4, characterized in that The intermediate taper roller transverse position is as follows: the upper roller distance from the operation side zero position is 18-20 mm, and the lower roller distance from the transmission side zero position is 20-25 mm in the first three passes; and the upper roller distance from the operation side zero position is 10-18 mm, and the lower roller distance from the transmission side zero position is 15-20 mm in the last four passes.

6. The rolling method according to claim 4, characterized in that, The intermediate taper roller body length is 85-110 mm, the roller end taper is 0.1-0.2 mm, and the crown from the transmission side to the operation side is 2-14 mm, 19-21 mm, 24-26 mm, 19-21 mm and 1-14 mm in sequence.

7. The rolling method according to claim 2, characterized in that, If the thickness of the strip to be rolled is less than δ0.1 mm, five times of cold rolling are needed, and the intermediate softening annealing is performed on the strip obtained after the four times of cold rolling.

8. The rolling method according to claim 7, characterized in that The intermediate softening annealing method is as follows: after the cold-rolled strip is degreased, cleaned and dried, the strip is controlled to have a softening annealing speed of 5.0-7.0 m / min in a hydrogen protection atmosphere at 1020-1060 ℃, so as to ensure that the hardness value HV of the strip is less than 240.

9. The rolling method according to claim 7, characterized in that, The five times of cold rolling are performed by using a twenty-roller rolling machine, the single pass reduction rate is less than or equal to 16%, the total pass reduction rate is 45%-65%, the working roller diameter is Ф15-18 mm, the precision is ±0.002 mm, the hardness is HRC 61-63, the tension adjustment range is 5-10 kN, the rolling force adjustment range is 100-200 kN, the working roller type is a flat roller, the intermediate taper roller type is a flat roller body+roller end taper, and the strip thickness is δ0.05-0.08 mm.

10. The rolling method according to claim 9, characterized in that The intermediate taper roller transverse position is as follows: the upper roller distance from the operation side zero position is 18-22 mm, and the lower roller distance from the transmission side zero position is 20-25 mm in the first three passes; and the upper roller distance from the operation side zero position is 8-18 mm, and the lower roller distance from the transmission side zero position is 12-20 mm in the last four passes.

11. The rolling method according to claim 9, characterized in that, The intermediate taper roller body length is 85-110 mm, the roller end taper is 0.1-0.2 mm, and the crown from the transmission side to the operation side is 2-13 mm, 20-22 mm, 21-24 mm, 16-22 mm and 2-13 mm in sequence.

12. The rolling method according to claim 1, characterized in that, The intermediate softening annealing method is that the strip after cold rolling is degreased, cleaned, dried, and then subjected to softening annealing treatment in a hydrogen protective atmosphere at 1020-1060 DEG C, and the strip speed of each softening annealing is controlled to ensure that the hardness value HV of the strip is less than 240.

13. The rolling method according to claim 12, characterized in that The strip speed of the first intermediate softening annealing is 0.5-2.0 m / min, and the strip speed of the second intermediate softening annealing is 2.0-5.0 m / min.

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