A method of cutting a target

Abstract

The application belongs to the technical field of target material preparation, and discloses a cutting method of a target material. The method comprises the following steps: taking a support plate and a backing plate; laying at least two support plates on two parallel guide rails of an online cutting machine respectively, laying the backing plate on the support plates, laying a target blank on the backing plate, drawing a target blank cutting track in a cutting area, setting a 0% position and a 100% position of the target blank cutting track as a cutting-in point and a cutting-out point respectively, setting n pause points between the cutting-in point and the cutting-out point, wherein n is greater than or equal to 1; sequentially and adjacently setting n+1 cutting sections between the cutting-in point, the n pause points and the cutting-out point, and sequentially cutting from the cutting-in point, supporting the backing plate with at least one support plate at the position of the backing plate cut in each cutting section after the completion of each cutting section, and fixing the support plate on the guide rail; and until the completion of the last cutting section, the cutting of the target material is completed. The target material cut by the method is not easy to crack and is not easy to have a broken edge.

Description

Technical Field

[0001] This invention belongs to the field of target preparation technology, and relates to a method for cutting a target, particularly a method for cutting a FeCuNbSiB target. Background Technology

[0002] Soft magnetic materials are key materials for the era of intelligentization, and their application market covers multiple sectors of the national economy. With the development of domestic photovoltaics, new energy vehicles, energy storage, and high-end home appliances, the domestic market demand for soft magnetic materials will continue to increase, and the industry has a promising future. FeCuNbSiB metallic materials have excellent soft magnetic properties, and as a new type of Fe-based alloy, an industry has gradually formed in China. FeCuNbSiB alloy targets are often prepared through a melting and casting process.

[0003] Currently, there are difficulties in cutting FeCuNbSiB alloy targets: For planar targets with good cutting performance, water jet cutting, diamond wire cutting, and electrical discharge wire cutting are widely used. For brittle planar targets that are prone to breakage and chipping, electrical discharge wire cutting is more commonly used. FeCuNbSiB targets prepared by the casting process are brittle, easily broken, and prone to chipping. The internal stress is difficult to completely eliminate. When using conventional planar target cutting processes, the target blank is prone to cracking during the cutting process, resulting in the scrapping of the target material. Summary of the Invention

[0004] To address the aforementioned problems in the existing technology, the present invention aims to provide a method for cutting target materials. The target materials cut by this method are less prone to cracking and edge chipping.

[0005] To achieve the above objectives, the technical solution adopted by the present invention is as follows: A method for cutting a target material includes the following steps: (1) Take support plates and pads. At least two support plates shall be set. Each support plate shall have the same thickness. The length / width of the pad shall be greater than the length / width of the target blank. Place at least two support plates on the two parallel guide rails of the wire EDM machine. The area between the two guide rails is the cutting area of ​​the wire EDM machine. Place the pad flat on the support plate and the target blank flat on the pad. Fix the pad on the guide rail. Measure the relative position of the target blank cutting reference line and the wire EDM machine reference line, adjust the target blank position so that the target blank cutting reference line is parallel to the wire EDM machine reference line and coincides with the Y-axis of the cutting point; Draw the target blank cutting trajectory within the cutting area, and set the 0% and 100% positions of the target blank cutting trajectory as the entry point and exit point, respectively. Set n pause points between the entry point and the exit point, where n≥1. Wherein, the position of the support plate does not exceed the inside of the target blank cutting trajectory; (2) Running the cutting process: n+1 cutting segments are set sequentially and adjacently between the entry point, n pause points, and exit point. Cutting is performed sequentially starting from the entry point. After each cutting segment is completed, at least one support plate is pushed to the part of the pad that is being cut in that cutting segment to support the pad, and the support plate is fixed on the guide rail. The cutting of the target material is completed until the last cutting segment is completed.

[0006] Furthermore, the number of support plates is n.

[0007] Furthermore, the support plate is selected to facilitate operation and ensure proper alignment with the pad after translation. In this invention, it is necessary to minimize the number of times the machine is stopped to move the support plate during operation, thereby reducing the impact of support plate movement on the target material.

[0008] More preferably, in the first n cutting segments, after each cutting segment is completed, a support plate is pushed to the part of the cutting segment where the pad is cut to support the pad, and the support plate is fixed on the guide rail.

[0009] More preferably, in the first n cutting segments, after each cutting segment is completed, the length of the support plate used for support is not less than the length of the part of the pad plate that was cut in that cutting segment.

[0010] More preferably, the support plate is pushed into the part of the cutting section pad that is being cut, so that the edge of the support plate extends beyond the cut part of the pad by at least 10mm.

[0011] Furthermore, in step (1), the support plate is placed 5-10 mm away from the target blank cutting trajectory. When the wire cutting machine reaches this position after the support plate extends beyond the support plate, it will cut the support plate. Due to the change in cutting thickness, the cutting effect will be affected, and in severe cases, problems such as wire breakage and equipment retraction may occur, seriously affecting the appearance and dimensional accuracy of the cut surface. If the support plate is too far from the cutting trajectory, the gap between the support plate and the pad will gradually increase after the support plate is translated, the support effect will weaken, or even lose its support function.

[0012] Furthermore, in step (1), the two ends of the pad are parallel to the guide rail.

[0013] Furthermore, the backing plate is made of carbon steel. More preferably, the surface of the backing plate needs to be in contact with the surface of the target blank to evenly bear the weight of the target blank; it supports the weight of the target blank before cutting, and gradually transfers the weight to the support plate as the cutting progresses. The support plate is typically made of a smooth surface free of burrs and other foreign objects, with low flatness, moderate strength, moderate thickness, minimal stress deformation during cutting, reasonable price, and good electrical conductivity.

[0014] Furthermore, in step (1), the target blank cutting trajectory is one of the following: circular, square, or elliptical.

[0015] Furthermore, two support plates are provided, with two pause points between the entry and exit points. The first pause point is located at 50% of the target blank cutting trajectory, and the second pause point is located at 85% of the target blank cutting trajectory. When cutting from 0% to 50%, the support plate can support the weight of the target blank as a whole. From 50% to 75%, the support capacity of the support plate gradually weakens. Therefore, a pause point is usually set at 50% to adjust the position of the support plates, so that the first support plate bears the weight of the cut portion of the target material and the support plate. A pause point is set at 85% to adjust the position of the second support plate, ensuring that the weight of the target blank and the support plate is entirely supported by the support plates, greatly reducing the impact of support plate deformation on the cutting effect.

[0016] Furthermore, the target blank is an FeCuNbSiB alloy target.

[0017] Compared with the prior art, the beneficial effects of the present invention are as follows: (1) The target material cutting method of the present invention is simple to operate, the tools used are simple and easy to obtain, and the target material cutting effect meets the requirements of the drawing; the cut target material is not easy to crack or chip; the target material is directly cut from the blank to the finished product, reducing the preparation process and reducing the preparation cost.

[0018] (2) The cutting method of the target material of the present invention: After the target blank is positioned, it is not clamped. The target blank is kept stable in position during the cutting process by its own weight and the friction between the target blank and the pad.

[0019] (3) The cutting method of the target material of the present invention uses a combination of pad and support plate to support the weight of the target blank, ensuring that the weight of the target blank is evenly transferred to the pad and support plate during the cutting process, without stress concentration problem, and the target material does not move during the cutting process.

[0020] (4) The cutting method of the target material of the present invention is particularly suitable for cutting the FeCuNbSiB target blank prepared by the melting and casting process to the finished size by an electric discharge wire cutting machine, which is not easy to crack or chip. Attached Figure Description

[0021] The accompanying drawings are provided to further illustrate the invention and form part of the specification. They are used in conjunction with embodiments of the invention to explain the invention and do not constitute a limitation thereof. In the drawings: Figure 1 This is a schematic diagram showing the positioning of the support plate, pad, and target blank during the preparation stage.

[0022] Figure 2 This is a schematic diagram of the target blank cutting process.

[0023] Wherein: 1—target blank, 2—pad plate, 3—first support plate, 4—second support plate, 5—guide rail. Detailed Implementation

[0024] To facilitate understanding of the present invention, the present invention will be described more fully and in detail below with reference to the accompanying drawings and preferred embodiments, but the scope of protection of the present invention is not limited to the following specific embodiments.

[0025] Unless otherwise defined, all technical terms used herein have the same meaning as commonly understood by those skilled in the art. The technical terms used herein are for the purpose of describing particular embodiments only and are not intended to limit the scope of the invention.

[0026] Example 1 This embodiment provides a FeCuNbSiB alloy target material with the following elemental composition: Fe 83.37%, Cu 1.29%, Nb 5.66%, Si 7.70%, B 1.98%. The target blank diameter is 340mm, and the target material size is 304.8*228.6mm. The target material is cut, and the specific cutting process is as follows: (1) such as Figure 1 As shown, prepare: a. Set up the support plates: Place the first support plate 3 (300*220mm) and the second support plate 4 (100*50mm) flat on the wire cutting guide rail 5.

[0027] b. Pad clamping: Place the 400*400*3mm carbon steel plate pad 2 flat on the support plate, adjust the position of pad 2 and the support plate so that the edge of pad 2 is parallel to the guide rail 5, place a small pad block (50*50mm) with the same thickness as the support plate under the clamping point of pad 2, and then use a G-type clamp to fix the pad on the guide rail.

[0028] c. Target positioning: Mark the target area on the surface of target blank 1 and establish a reference line. Place target blank 1 flat on pad 2, measure the relative position of the target blank cutting reference line and the wire EDM machine reference, and adjust the target blank position so that the target blank cutting reference line is parallel to the wire EDM machine reference and coincides with the Y-axis of the molybdenum wire entry point.

[0029] d. Setting Pause Points and Simulating Program Execution: Draw the target cutting trajectory, set the cutting process parameters, and set pause points 1 and 2 at 50% and 85% of the target cutting trajectory. Import the machining program, start the simulation mode, and confirm that the simulated running trajectory is consistent with the target trajectory. Confirm that the program automatically pauses when it reaches pause point 1. After restarting the machining task, the program will run from pause point 1 to pause point 2 and then automatically pause again. After restarting the machining task, the program will run from pause point 2 to the exit point.

[0030] See Figure 2 Start running: (2) Run 1: a. Cutting 1: Turn on the working fluid and the molybdenum wire tube. After the equipment is running stably, start the cutting program. Cutting parameters: pulse width 15us, pulse interval 3us, number of power amplifier tubes 3, tracking 4 steps, molybdenum wire compensation 0.105mm.

[0031] The equipment begins to complete the cutting trajectory between the entry point and the pause point 1.

[0032] b. Pause 1: Automatically stop when cutting to pause point 1.

[0033] c. Clamping of support plate 1: Push support plate 1 into the cutting position of the target base plate, so that the edge of the support plate extends at least 10mm beyond the cut position of the base plate, and fix support plate 1 on the wire cutting guide rail to ensure that the weight of the target and base plate in the cut area is borne by support plate 1.

[0034] (3) Run 2: a. Cutting 2: Turn on the working fluid and the molybdenum wire drum. After the equipment is running stably, start the cutting program. The equipment will begin to complete the cutting trajectory between pause point 1 and pause point 2.

[0035] b. Pause 2: Automatically stop the machine when cutting to pause point 2.

[0036] c. Clamping of support plate 2: Push support plate 2 into the cutting position of the target base plate, so that the edge of the support plate extends at least 10mm beyond the cut position of the base plate, and fix support plate 2 on the wire cutting guide rail. Ensure that the weight of the target and base plate in the cut area is borne by support plate 1 and support plate 2. Observe the stress points of support plate 1 and support plate 2, and perform stress analysis on the target to ensure the stability of the stress points, so as to prevent displacement when the target is cut to the last part.

[0037] (4) Run 3: a. Complete the cutting: Turn on the working fluid and the molybdenum wire drum. After the equipment is running stably, start the cutting program. The equipment will begin to complete the cutting trajectory between pause point 2 and temporary exit point. The equipment will automatically stop after the processing task is completed.

[0038] b. Remove the target blank: After confirming that the target material has been cut, remove the target material, clean the working fluid from the surface of the target material and store it safely. Remove the scraps, backing plate, support plate and fixture after the target blank is cut. This cutting work is now complete.

[0039] Comparative Example 1 The difference between Comparative Example 1 and Example 1 is that: In this comparative example, no backing plate or support plate was used during target blank cutting; the target blank was placed directly on the machine tool guide rail for cutting.

[0040] Specifically: This comparative example discloses a FeCuNbSiB alloy target material with the following elemental composition: Fe 83.37%, Cu 1.29%, Nb 5.66%, Si 7.70%, B 1.98%. The target blank diameter is 340 mm, and the target material size is 304.8 * 228.6 mm. The specific cutting process is as follows: (1) Preparation: a. Target positioning: Mark the target area on the surface of the target blank and establish a baseline. Place the target blank flat on the wire EDM machine guide rail, measure the relative position of the target blank cutting baseline and the wire EDM machine reference, adjust the target blank position so that the target blank cutting baseline is parallel to the wire EDM machine reference, the target blank cutting baseline coincides with the Y-axis of the molybdenum wire entry point, and the target blank cutting edge is 10~25mm away from the machine guide rail for safety. Fix the target blank with a G-clamp.

[0041] d. Setting Pause Points and Simulating Program Execution: Draw the target cutting trajectory, set the cutting process parameters, and set pause points 1 and 2 at 50% and 85% of the target cutting trajectory. Import the machining program, start the simulation mode, and observe that the simulated running trajectory matches the target trajectory. Confirm that the program automatically pauses when it reaches pause point 1. After restarting the machining task, the program will run from pause point 1 to pause point 2 and then automatically pause again. After restarting the machining task, the program will run from pause point 2 to the exit point.

[0042] (2) Run 1: a. Cutting 1: Turn on the working fluid and the molybdenum wire tube. After the equipment is running stably, start the cutting program. Cutting parameters: pulse width 15us, pulse interval 3us, number of power amplifier tubes 3, tracking 4 steps, molybdenum wire compensation 0.105mm.

[0043] The equipment begins to complete the cutting trajectory between the entry point and the pause point 1.

[0044] The target blank cracked when the cutting program was 17% complete.

[0045] Comparative Example 2 Compared with Example 1, Comparative Example 2 differs in that: In this comparative example, only a pad was set during target blank cutting, without a support plate. A magnet was set in the post-cut area, and the magnetic force of the magnet on the pad supported the weight of the target blank and the pad after cutting.

[0046] Specifically: This comparative example discloses a FeCuNbSiB alloy target material with the following elemental composition: Fe 83.37%, Cu 1.29%, Nb 5.66%, Si 7.70%, B 1.98%. The target blank diameter is 340 mm, and the target material size is 304.8 * 228.6 mm. The specific cutting process is as follows: (1) Preparation: a. Pad clamping: Place the 400*400*3mm carbon steel plate pad flat on the support plate, adjust the position of the pad and the support plate so that the edge of the pad is parallel to the guide rail, and fix the pad on the guide rail with a G-type clamp.

[0047] c. Target positioning: Mark the target area on the surface of the target blank and establish a reference line. Place the target blank flat on the pad, measure the relative position of the target blank cutting reference line and the wire EDM machine reference line, and adjust the target blank position so that the target blank cutting reference line is parallel to the wire EDM machine reference line and coincides with the Y-axis of the molybdenum wire entry point.

[0048] d. Setting Pause Points and Simulating Program Execution: Draw the target cutting trajectory, set the cutting process parameters, and set pause points 1, 2, and 3 at 25%, 50%, and 75% of the target cutting trajectory. Import the machining program, start the simulation mode, and observe that the simulated running trajectory matches the target trajectory. Confirm that the program automatically pauses when it reaches pause point 1. After restarting the machining task, the program will run from pause point 1 to pause point 2 and then automatically pause. After restarting the machining task, the program will run from pause point 2 to pause point 3 and then automatically pause. After restarting the machining task, the program will run from pause point 3 to the exit point.

[0049] (2) Run 1: a. Cutting 1: Turn on the working fluid and the molybdenum wire tube. After the equipment is running stably, start the cutting program. Cutting parameters: pulse width 15us, pulse interval 3us, number of power amplifier tubes 3, tracking 4 steps, molybdenum wire compensation 0.105mm.

[0050] The equipment begins to complete the cutting trajectory between the entry point and the pause point 1.

[0051] b. Pause 1: Automatically stop when cutting to pause point 1.

[0052] c. Installation of magnet 1: Install magnet 1 on the cutting position between the bottom cut point and the pause point 1 of the pad, so that about 80% to 90% of the magnet is attracted to the outside of the cut of the pad, and 10% to 20% is reserved to be attracted to the inside of the cut of the pad, to ensure that the magnet's attraction can support the weight of the target and the pad after cutting.

[0053] (3) Run 2: a. Cutting 2: Turn on the working fluid and the molybdenum wire drum. After the equipment is running stably, start the cutting program. The equipment will begin to complete the cutting trajectory between pause point 1 and pause point 2.

[0054] b. Pause 2: Automatically stop the machine when cutting to pause point 2.

[0055] c. Installation of the base magnet 2: Install the base magnet 2 at the cutting position between the pause point 1 and the pause point 2 at the bottom of the pad, so that about 80% to 90% of the base magnet is attracted to the outside of the pad cutting, leaving 10% to 20% attracted to the inside of the pad cutting. Ensure that the attraction force of the base magnet can withstand the weight of the target and the pad after cutting, and ensure the stability of the force point to prevent displacement when the target is cut to the last part.

[0056] (6) Run 3: a. Complete the cutting: Turn on the working fluid and the molybdenum wire drum. After the equipment is running stably, start the cutting program. The equipment will start the cutting program between pause point 2 and pause point 3. When the program runs to 71%, the scrap of the target blank will crack and cracks will appear on the surface of the target material.

[0057] The above are merely preferred embodiments of the present invention and are not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of the present invention.

Claims

1. A method for cutting a target material, characterized in that, Includes the following steps: (1) Take support plates and pads. At least two support plates shall be set. Each support plate shall have the same thickness. The length / width of the pad shall be greater than the length / width of the target blank. Place at least two support plates on the two parallel guide rails of the wire EDM machine. The area between the two guide rails is the cutting area of ​​the wire EDM machine. Place the pad flat on the support plate and the target blank flat on the pad. Fix the pad on the guide rail. Measure the relative position of the target blank cutting reference line and the wire EDM machine reference line, adjust the target blank position so that the target blank cutting reference line is parallel to the wire EDM machine reference line and coincides with the Y-axis of the cutting point; Draw the target blank cutting trajectory within the cutting area, and set the 0% and 100% positions of the target blank cutting trajectory as the entry point and exit point, respectively. Set n pause points between the entry point and the exit point, where n≥1. The support plate is laid out in a way that avoids the target blank cutting trajectory; (2) Running the cutting process: n+1 cutting segments are set sequentially and adjacently between the entry point, n pause points, and exit point. Cutting is performed sequentially starting from the entry point. After each cutting segment is completed, at least one support plate is pushed to the part of the pad that is being cut in that cutting segment to support the pad, and the support plate is fixed on the guide rail. The cutting of the target material is completed until the last cutting segment is completed. The support plate consists of two pieces, and two pause points are set between the entry point and the exit point. The first pause point is located at 50% of the target blank cutting trajectory, and the second pause point is located at 85% of the target blank cutting trajectory. The target blank is an FeCuNbSiB alloy target.

2. The cutting method as described in claim 1, characterized in that, The number of support plates is n.

3. The cutting method as described in claim 2, characterized in that, In the first n cutting segments, after each cutting segment is completed, a support plate is pushed to the part of the pad that was cut in that cutting segment to support the pad, and the support plate is fixed on the guide rail.

4. The cutting method as described in claim 3, characterized in that, In the first n cutting segments, after each cutting segment is completed, the length of the support plate used for support is not less than the length of the part of the pad plate that was cut in that cutting segment.

5. The cutting method as described in claim 3, characterized in that, Push the support plate into the part of the cutting section of the pad that is being cut, so that the edge of the support plate extends at least 10mm beyond the cut of the pad.

6. The cutting method as described in claim 1, characterized in that, In step (1), the support plate is laid 5-10 mm away from the target blank cutting trajectory.

7. The cutting method as described in claim 1, characterized in that, In step (1), the two ends of the pad are parallel to the guide rail.

8. The cutting method as described in claim 1, characterized in that, In step (1), the target blank cutting trajectory is one of the following: circle, square, or ellipse.

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