Low-loss amorphous alloy thin strip, and manufacturing device and method therefor

Abstract

A manufacturing method for an amorphous alloy thin strip having a notch. The method comprises: during a notching operation, using a cutting roller to form a notch on a smooth amorphous alloy strip, wherein the cutting roller is provided with a cylindrical body, at least one helically extending blade portion is provided on the surface of the body, and during the notching operation, the cutting roller presses against the amorphous alloy strip and rotates; and the blade portion has a tip angle in the range of 20°-30° and a notching pressure in the range of 5-8 g, and there is an included angle in the range of 20°-60° between the extension direction of any position on the blade portion and the travel direction of the amorphous alloy strip.

Description

A low-loss amorphous alloy thin strip and its manufacturing equipment and method Technical Field

[0001] This invention relates to an amorphous alloy strip and a method for manufacturing the same, specifically to an amorphous alloy strip having appropriate magnetic domain refinement grooves on its surface. Background Technology

[0002] Amorphous alloy materials possess excellent properties such as high and low coercivity, high permeability, low saturation magnetization, and high resistivity, making them widely used in the electronics, power, and new energy industries. Amorphous alloy strips are commonly used in distribution transformers to reduce no-load losses due to their low magnetic loss. To further reduce anomalous eddy current losses (a significant component of iron loss), linear or dot-like indentations can be created on the surface of the amorphous alloy strip to refine magnetic domains and reduce domain width. However, due to the thinness, high hardness, low toughness, and susceptibility to stress of amorphous alloy strips, it is difficult to create satisfactory indentations using mechanical methods in mass production. Currently, major manufacturers primarily use laser indentation as the preferred method for reducing iron loss and improving the performance of amorphous alloy strips.

[0003] Japanese Patent Publication No. 3-32886 discloses a method for improving the magnetic properties of amorphous ribbons using laser etching. The method involves irradiating the amorphous alloy ribbon with a pulsed laser along its width direction, thereby locally and instantaneously melting the surface of the ribbon, followed by rapid cooling and solidification to form a dotted array of amorphous spots, thus refining the magnetic domains.

[0004] During laser marking, the high temperatures generated by laser irradiation can lead to phase explosions, primarily in the form of boiling and sputtering. This results in the formation of remelted material and spatter in the marked area, disrupting the uniformity and smoothness of the marked region. The molten recrystallized material also negatively impacts the strip's properties. In particular, the molten material generated by ablation sputtering inevitably and uncontrollably accumulates on both sides of the marked groove, affecting the stacking factor of subsequent manufactured products. Furthermore, laser marking methods consume a lot of energy, leading to higher production costs.

[0005] Summary of the Invention

[0006] In view of the above-mentioned shortcomings of the existing technology, the purpose of this invention is to provide a mechanical manufacturing method for low-loss amorphous alloy thin strips, which can produce low-loss amorphous alloy thin strips with low excitation power, high flatness, and energy saving.

[0007] In one embodiment, the present invention provides a method for manufacturing a scored amorphous alloy strip, the method comprising forming scores on a smooth amorphous alloy strip using a cutting roller during a scoring operation; wherein the cutting roller has a cylindrical body, and at least one spirally extending cutting edge is provided on the surface of the body; during the scoring operation, the cutting roller presses against the amorphous alloy strip and rotates; wherein the blade tip angle of the cutting edge is in the range of 20°-30°, the scoring pressure is in the range of 5-8g, and the extension direction of any point on the cutting edge has an angle in the range of 20-60° with the travel direction of the amorphous alloy strip.

[0008] In another embodiment, the present invention provides another method for manufacturing a scored amorphous alloy strip, the method comprising forming scores on a smooth amorphous alloy strip using a cutting roller during a scoring operation; wherein the cutting roller has a cylindrical body with at least one laterally extending cutting edge on the surface of the body, the cutting roller pressing against the amorphous alloy strip during the scoring operation, and rotating about a central axis while moving in a direction perpendicular to the strip's travel direction, wherein the pressure at the cutting edge is 0.1-1 MPa / cm during the scoring operation. 2 Within the range.

[0009] In one embodiment, the present invention provides a manufacturing apparatus for forming notches on an amorphous alloy strip, the apparatus comprising: a feeding unit for feeding a strip coil; a length measuring mechanism for measuring the length traveled by the strip; a tension detection mechanism for detecting the tension of the strip; a tension adjustment mechanism for adjusting the tension of the strip; a process correction mechanism for ensuring that the strip does not deviate during operation; a notching mechanism for notching the strip; and a take-up mechanism for taking up the notched amorphous alloy strip; wherein the notching mechanism includes a cutter roller traveling mechanism, a cutter roller, and an anvil, the cutter roller having a cylindrical body and at least one cutting edge protruding from the surface of the body and extending circumferentially or spirally on the surface of the body.

[0010] The amorphous alloy strip with grooves produced according to the present invention has the advantage of small protrusions on both sides of the grooves, which improves the lamination factor of the iron core made therefrom and further reduces losses and excitation power. Attached Figure Description

[0011] Figure 1 schematically illustrates the integral mechanical scoring device according to the present invention.

[0012] Figures 2a and 2b schematically show side views of the scoring mechanism in the integral mechanical scoring device according to the present invention.

[0013] Figure 3 schematically illustrates the transverse cutter roller according to the present invention.

[0014] Figures 4a and 4b schematically illustrate the spiral cutter roller according to the present invention.

[0015] Figures 5a-5e schematically show various marking arrangements on the strip, where Figure 5a shows a continuous linear marking array, Figure 5b shows a discontinuous linear marking array, Figures 5c and 5d show staggered discontinuous linear marking arrays, and Figure 5e shows a discontinuous linear marking array with an angle.

[0016] Figure 6 schematically shows the etched area on the strip surface. Detailed Implementation

[0017] The specific details of the present invention will be described in detail below with reference to the accompanying drawings and specific embodiments. However, it should be understood that the described embodiments are merely exemplary. Those skilled in the art can make changes based on the embodiments of the present invention without departing from the scope of protection claimed by the present invention.

[0018] This invention provides a method for forming grooves on the surface of an amorphous alloy strip to refine magnetic domains using a mechanical scribing method. Figure 1 schematically shows the overall apparatus for the mechanical scribing method according to the invention.

[0019] The overall equipment shown in Figure 1 is controlled by an electronic control system and includes a feeding unit 1, a length counting mechanism 2, a tension detection mechanism 3, a tension adjustment mechanism 4, a process correction mechanism 5, a scoring mechanism 6, and a receiving mechanism 7.

[0020] During equipment operation, the feeding mechanism 1 feeds the strip coil. The strip coil material fed by the feeding mechanism 1 passes through the process roller and enters the length counting mechanism 2. The length counting mechanism 2 is mainly used to measure the length of the strip traveled, especially when using a transverse cutter roller, to control the travel of a certain length after each marking before stopping to perform the next marking.

[0021] The main structure of the length counting mechanism 2 includes three rollers. The two lower rollers are steel rollers, namely the first redirecting roller A and the second redirecting roller B. The upper roller is a length counting roller with a rubber surface. An encoder is connected to the central shaft of the length counting roller to measure the travel length of the strip.

[0022] The strip enters the first deflector roller A from below, then extends upwards around the length counting roller, then downwards around the second deflector roller B from the lower left, and finally leaves the length counting mechanism 2 from the right side of the second deflector roller B.

[0023] To ensure the accuracy of strip measurement, the length counting roller and the strip must travel synchronously without slippage. Therefore, in addition to designing the length counting roller to be made of rubber to increase friction, the area of ​​the strip passing over the length counting roller can also be increased. According to a preferred embodiment, the distance between the first redirecting roller A and the second redirecting roller B is designed to be smaller than the diameter of the length counting roller. This allows the strip passing over the length counting roller to cover most of the circumference of the roller, thereby further increasing friction and improving the accuracy of strip travel length measurement.

[0024] The strip exiting the length counting mechanism 2 passes sequentially through the tension detection mechanism 3 and the tension adjustment mechanism 4. Based on the feedback from the tension detection mechanism 3, the tension adjustment mechanism 4 adjusts the tension of the strip. Tension detection and adjustment offer the following advantages: preventing excessive strip tension that could lead to breakage; ensuring the strip is taut on the anvil of the scoring mechanism when it subsequently enters the scoring station, facilitating scoring operations; and preventing insufficient strip tension, which would result in inaccurate length measurement by the length counting mechanism 2 due to insufficient friction between the strip and the rollers.

[0025] The process correction mechanism 5 ensures that the strip enters the scoring mechanism 6 at a suitable processing position without deviation, thereby ensuring the scoring quality.

[0026] After the strip is scored in the scoring mechanism 6, it enters the take-up mechanism 7. The take-up mechanism 7 includes a guide roller system and a take-up tray. The guide roller system includes a floating roller to ensure the tension of the strip in the take-up mechanism and the tension of the scored strip in the scoring mechanism.

[0027] Figures 2a and 2b specifically illustrate the scoring mechanism 6 according to the present invention. The scoring mechanism 6 includes a cutter roller traveling mechanism, a cutter roller, and an anvil. As shown in Figure 2a, the cutter roller traveling mechanism includes at least two electric cylinders 601 for controlling the up-and-down movement of the cutter roller, which are preferably arranged on the periphery to ensure that the lower cutter roller is subjected to uniform force during scoring without deviation. A linear motor 602 is fixed below the electric cylinders 601, and a cutter roller 603 in the form of a pressure roller is fixedly mounted on the traveling component of the linear motor 602. During the scoring operation, the amorphous alloy strip is laid on the anvil 604, and the traveling component of the linear motor 602 drives the cutter roller 603 to move linearly from its initial position along the traveling direction, and continuously rolls it on at least one side of the amorphous alloy strip to form mechanical scores on the surface of the strip. Subsequently, the scored amorphous strip portion travels away from the scoring mechanism, and the cutter roller 603 returns to its initial position with the traveling component of the motor for the next scoring operation. As shown in Figure 2b, process rollers 605 are respectively provided on both sides of the anvil 604. The upper surface of the outer diameter of the process roller 605 is on the same plane as the upper surface of the anvil. This ensures that the strip is tensioned and the marking is accurate during the marking process, while avoiding the strip from rubbing against the outer edges of the anvil and reducing the risk of the strip being scratched.

[0028] In one embodiment, the cutter roller 603 according to the invention takes the form of a transverse cutter roller 610 as shown in FIG. 3. The transverse cutter roller 610 has a cylindrical body 612 with a central axis 611. At least one cutting edge 613 in the form of a raised ridge is provided circumferentially on the surface of the body 612. In the embodiment shown in FIG. 3, the cutting edge 613 extends transversely on the body 612, that is, the central plane passing through the end of the cutting edge 613 is perpendicular to the axis 611. When installed in the scoring mechanism 6, the axis 611 of the transverse cutter roller 610 can form an angle of less than 45° with the travel direction of the strip as needed. Thus, when the traveling component of the linear motor is started, the transverse cutter roller 610 is driven to move linearly in a travel direction perpendicular to the strip casting direction. At the same time, the transverse cutter roller 610 is driven to rotate about the central axis 611 under the interaction with the strip, thereby rolling the strip that is stationary on the anvil below, so that the cutting edge 613 squeezes the strip material, thereby creating a score on the surface of the strip.

[0029] In another embodiment, the cutter roller 603 according to the invention takes the form of a spiral cutter roller 620 as shown in Figures 4a and 4b. The spiral cutter roller 620 has a cylindrical body 622 with a central axis 621. The surface of the body 622 is provided with at least one cutting edge 623 in the form of a raised ridge. In the embodiment shown in Figures 4a and 4b, the cutting edge 623 extends spirally on the surface of the body 622. The spiral cutter roller 620 is mounted in the scoring mechanism 6 with its axis 621 perpendicular to the travel direction of the strip. Thus, when the traveling component of the linear motor is activated, the spiral cutter roller 620 is driven to move in a travel direction parallel to the strip casting direction, and is simultaneously driven to rotate about the central axis 621, thereby rolling the strip below, causing the cutting edge 623 to compress the strip material, thereby creating scoring on the surface of the strip.

[0030] The spiral cutter roller can also be a passive roller. In this embodiment, the scoring mechanism may not have a linear motor. During the scoring operation, the electric cylinder 601 presses down, the spiral cutter roller squeezes the strip material, and is thus driven by the forward-moving strip to rotate along the strip surface, leaving scores at an angle to the strip width direction. This driven mode of the spiral cutter roller is preferred.

[0031] The extension direction of the cutting edge at any point on the spiral cutter roller 620 can have an angle of 0-90° with the strip travel direction. The strip travel direction is perpendicular to the axis of the spiral cutter roller. When this angle is less than 20°, the follower effect of the spiral cutter roller is poor, and slippage is likely to occur, resulting in unstable marking. When the angle is larger, although the marking operation is stable, it will cause greater wear on the cutter roller; in addition, a larger angle between the cutting edge and the strip travel direction will result in a larger angle between the marking formed on the strip surface and the strip width direction, which is not conducive to the effect of marking to refine magnetic domains. Therefore, preferably, the angle is 20-60°, more preferably, the angle is 20-45°, and even more preferably, the angle is 20°.

[0032] Mechanical scoring can be continuous or discontinuous, appearing as dots or lines. For processing efficiency, scoring is preferably a series of continuous or discontinuous lines.

[0033] The cutting edges of the transverse cutter roller in Figure 3 and the spiral cutter rollers shown in Figures 4a and 4b are continuous, thus forming continuous linear grooves on the strip surface. However, the cutting edges can also be discontinuous, resulting in discontinuous linear grooves.

[0034] The cutter roller can also consist of multiple cutter roller modules that can be disassembled and installed in groups. In this case, only the worn or damaged cutter roller sections can be removed and repaired or replaced by grinding, without having to replace the entire cutter roller.

[0035] Figures 5a-5e show partial examples of the scoring arrangements that can be achieved on the strip by the transverse cutter roller 610 and the spiral cutter roller 620. Depending on the desired scoring arrangement on the strip, multiple cutting edges spaced apart axially or circumferentially can be provided on the transverse cutter roller 610. Alternatively, multiple transverse cutter rollers with cutting edges can be fixed side-by-side on the traveling component of the linear motor 602, wherein the cutting edges of each transverse cutter roller can be aligned with or staggered from the cutting edges of other transverse cutter rollers as needed. The spiral cutter roller 620 can also have multiple cutting edges (as shown in Figure 4b). The axial length of the spiral cutter roller can be set as needed. Typically, the axial length of the cutter roller is greater than the width of the strip.

[0036] Figures 5a-5d show the arrangement of notches with the notch extension direction perpendicular to the strip travel direction.

[0037] In Figures 5a-5b, preferably, the spacing between adjacent grooves is 1-30 mm, more preferably 2 mm, even more preferably 3 mm, and still more preferably 5 mm. The length of the groove in the width direction of the amorphous alloy strip accounts for not less than 70%, preferably 100%. In the discontinuous linear groove arrangement shown in Figure 5b, discontinuous linear groove rows are formed by linear groove segments. Assuming the width of the amorphous alloy strip is D, the length of any groove segment in the discontinuous linear groove row is approximately d, and the number of grooves is m (m≥1), then D≥dm. In this discontinuous linear groove, each groove segment may be inconsistent. This is because during the mechanical groove process, inconsistent groove pressure or tool wear will cause deviations in the length of each groove segment, for example, causing some groove segments to not completely scratch the surface of the amorphous alloy strip.

[0038] Discontinuous notches can also be arranged in a stepped, staggered pattern, as shown in Figure 5c. In a notch row consisting of one or more notch segments extending along the width direction of the amorphous alloy strip, the distance h between adjacent notch segments along the strip casting direction should not be too large, otherwise the magnetic domain refinement effect cannot be achieved. Assuming the spacing between adjacent notch rows is H, and each notch row includes m notch segments, the distance between adjacent notch segments along the strip casting direction in each notch row should satisfy h ≤ H / 2(m-1). Thus, the spacing between notch segments along the strip casting direction in each notch row can be controlled to be not too large, and the uniformity of the notch segment arrangement can be ensured.

[0039] Under the condition that the above formula is satisfied, each segment of the non-continuous linear notch can be arranged arbitrarily. Another arrangement is shown in Figure 5d.

[0040] Figure 5e illustrates a discontinuous linear groove arrangement where the grooves form an angle with the strip casting direction, which can be achieved, for example, by a spiral cutter roller 620 on the strip. Each groove segment in the discontinuous linear groove can be inclined; preferably, the angle r between each groove segment and the strip casting direction is greater than 45°, preferably not less than 70°, and preferably not less than 80°. Furthermore, the angle R between the line connecting the endpoints of the discontinuous linear groove on one side of the strip and the strip casting direction is greater than 45°, preferably greater than 80°, and more preferably 90°. And ∠R ≤ ∠r.

[0041] The mechanical scoring roller according to the present invention is made of high-hardness materials such as high-speed steel, ceramic steel, and tungsten carbide steel. The method according to the present invention is applicable to Fe-based amorphous alloy strips of various compositions. The amorphous alloy strip can be an uncut strip after casting (e.g., a strip roll) or a strip that has been cut to the desired size after casting. Preferably, the thickness of the amorphous alloy strip is 24-30 μm.

[0042] Figure 6 shows the morphology of the amorphous alloy strip after being scored using the mechanical scoring method according to the present invention. During the mechanical scoring process of the present invention, the cutting edge of the cutter roller presses against the strip surface 800 to form a scoring groove 801. This typically leads to material accumulation at the outer edge of the scoring groove 801, producing a protrusion 802 as shown in Figure 6. If a large protrusion exists on at least one side of the scoring groove, it will severely affect the lamination factor when subsequently using the strip to manufacture devices such as transformer cores, impacting the transformer's design magnetic flux density. Generally, when the height of the protrusion is less than 0.5 μm, it can be considered a micro-protrusion; while when the height of the protrusion is greater than 0.5 μm, it is considered a large protrusion, which will have a significant adverse effect on the strip's performance.

[0043] To create effective scoring, the pressure at the contact point between the cutting edge of the cutter roller and the strip should be maintained between 0.1 and 1.5 MPa / cm. 2 Preferably, the blade pressure at the contact point between the blade of the cutter roller and the strip is set at 0.36-0.56 MPa / cm. 2 More preferably, within the range of 0.4 MPa / cm 2 This allows for better control over the height of the protrusions, as well as the width and depth of the grooves.

[0044] Table 1 below shows the pressure at the contact point between the blade and the strip using tungsten carbide spiral cutter rollers, ranging from 0.1 to 1.5 MPa / cm. 2 The measurement results of the groove morphology under the condition that the blade tip angle is 8°-82°, and the groove has a spacing h of 15mm and an angle R of 70° with the strip casting direction.

[0045] As can be seen from the table above, when the blade tip angle is between 20° and 30°, and the scoring pressure is set at 0.36-0.56 MPa / cm, 2 Within a certain range, it is possible to achieve micro-protrusion at the edge of the groove to obtain the best surface morphology.

[0046] Table 2 below shows the wear values ​​of the grooved bands in the aforementioned experiments.

[0047] As can be seen from the table above, the grooved band with micro-protrusions has lower wear than the grooved band with large protrusions.

[0048] When using a transverse cutting roller, the pressure on both sides of the cutting edge is roughly the same during scoring, making it easier to control the protrusion. However, appropriate parameters still need to be selected to avoid excessive protrusion. This invention proposes setting the pressure at the cutting edge at 0.1-1.5 MPa / cm by controlling the pressure. 2Preferably 0.4 MPa / cm 2 It can achieve a height of no more than 0.5μm on both sides of the groove, or even no protrusion at all.

[0049] The table below lists a comparison of parameters between mechanically etched amorphous alloy ribbons and laser-etched amorphous alloy ribbons prepared according to the method of the present invention.

[0050] The table below shows a comparison of some parameters between a mechanically scored tape with micro-protrusions obtained using the mechanical scoring method of this invention and a laser-scored tape obtained using a conventional laser scoring method, both using the same FeSiBC amorphous alloy strip as the substrate. The mechanically scored tape in the embodiment and the laser-scored tape in the comparative example have the same scoring arrangement, with a scoring spacing of 15 mm; the scoring depth is in the range of 3-4.5 μm, preferably 3.5 μm; and the scoring width is in the range of 27-33 μm, preferably 28 μm. Within this range, variations in scoring depth and width do not affect the performance of the scored tape. Therefore, the mechanically scored tape and the laser-scored tape used in the experiment preferably have the scoring specifications described above.

[0051] As can be seen from the table above, the stacking coefficient of the mechanically scored strip according to the present invention is better than that of the laser scored strip with the same scoring arrangement, and it has iron loss that is roughly equivalent to that of the laser scored strip.

[0052] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A method of manufacturing a notched amorphous alloy ribbon, characterized by, The method includes forming grooves on a smooth amorphous alloy strip using a cutting roller during a scribing operation; The cutting roller has a cylindrical body, and at least one spirally extending cutting edge is provided on the surface of the body. During the scoring operation, the cutting roller presses against the amorphous alloy strip and rotates. The blade head included angle of the blade part is in the range of 20-30°, the blade part notch pressure is in the range of 0.1-1.5 MPa / cm 2 The extension direction of any place on the blade part has an included angle in the range of 20-60° with the running direction of the amorphous alloy strip.

2. The method of claim 1, wherein, During the scoring operation, the cutter roller, driven by a motor, moves in a direction parallel to the travel direction of the amorphous alloy strip.

3. The method of claim 1, wherein, During the scoring operation, the amorphous alloy strip drives the cutter roller to rotate.

4. The method of any one of claims 1-3, wherein, The extension direction of any point on the cutting edge forms an angle between the direction of travel of the amorphous alloy strip and the direction of travel of the strip within the range of 20-45°.

5. The method of any one of claims 1-3, wherein, The extension direction of any point on the cutting edge forms an angle of 20° with the travel direction of the amorphous alloy strip.

6. The method of any one of claims 1-3, wherein, During the scoring operation, the pressure at the blade is in the range of 0.36-0.56 MPa / cm 2 .

7. The method of claim 6, wherein, During the scoring operation, the pressure at the blade is 0.4 MPa / cm 2 .

8. A method of manufacturing a notched amorphous alloy ribbon, characterized by, The method includes forming grooves on a smooth amorphous alloy strip using a cutting roller during a scribing operation; The cutter roller has a cylindrical body, and at least one laterally extending cutting edge is provided on the surface of the body. During the scoring operation, the cutter roller presses against the amorphous alloy strip and rotates about a central axis while moving in a direction perpendicular to the strip's travel direction. wherein, during the scoring operation, the pressure at the blade is between 0.1 and 1.5 MPa / cm 2 of the range Within the enclosure.

9. The method of claim 8, wherein, During the scoring operation, the pressure at the blade is in the range of 0.36-0.56 MPa / cm 2 .

10. The method of claim 9, wherein, During the scoring operation, the pressure at the blade is 0.4 MPa / cm 2 .

11. An amorphous alloy ribbon, wherein, The amorphous alloy strip has one or more continuous or discontinuous linear grooves formed on its surface using a cutting roller.

12. The amorphous alloy ribbon of claim 11, wherein, The protrusions on both sides of the groove are no higher than 0.5 μm.

13. The amorphous alloy ribbon of claim 11 or 12, wherein, The direction of the groove extension is perpendicular to the casting direction of the amorphous alloy strip.

14. The amorphous alloy ribbon of claim 13, wherein, The distance between adjacent grooves is 1-30 mm.

15. The amorphous alloy ribbon of claim 13 wherein, The extension length of the groove is greater than or equal to 70% of the width of the amorphous alloy strip.

16. The amorphous alloy ribbon of claim 13 wherein, For a discontinuous linear groove series formed by linear groove segments, assuming the width of the amorphous alloy strip is D, the length of any groove segment in the discontinuous linear groove series is d, and the number of grooves is m (m≥1), then D≥dm.

17. The amorphous alloy ribbon of claim 11, wherein, For a discontinuous linear groove column formed by linear groove segments, assuming the spacing between adjacent groove columns is H, each groove column includes m groove segments, and the distance between adjacent groove segments in each groove column along the strip casting direction satisfies h≤H / 2(m-1).

18. The amorphous alloy ribbon of claim 11 or 12, wherein, The non-continuous linear grooves are formed by linear groove segments, and the angle ∠r between each groove segment and the strip casting direction is greater than 45°.

19. The amorphous alloy ribbon of claim 18, wherein, The angle ∠R between the line connecting the endpoints of one side of the strip and the casting direction of the strip is greater than 45° and ∠R ≤ ∠r.

20. A manufacturing apparatus for forming grooves on an amorphous alloy strip, the apparatus comprising: The feeding unit feeds the strip coil; A tension adjustment mechanism for adjusting the tension of the strip; A process correction mechanism ensures that the strip does not shift during operation; and A scoring mechanism that scores the strip material. The scoring mechanism includes a cutter roller traveling mechanism, a cutter roller, and an anvil. The cutter roller has a cylindrical body and at least one cutting edge that protrudes from the surface of the body and extends circumferentially or spirally on the surface of the body.

21. The manufacturing apparatus of claim 20, wherein, The manufacturing equipment also includes: A length-counting mechanism that measures the length of the strip traveled; A tension detecting mechanism detects the tension of the strip. A take-up mechanism winds up the amorphous alloy strip that has been subjected to the notching.

22. The manufacturing apparatus of claim 20, wherein, The extension direction of any point on the blade portion has an angle in the range of 30-70° with the axis of the knife roll.

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