A manufacturing process of a large-curvature lamination sheet di-magnet core

Abstract

The application discloses a manufacturing process of a large-curvature punching sheet dipole magnet core, which comprises the following steps: 1. laminating core bonding end plates; 2. laminating quarter cores, and welding inner and outer arc plates; 3. laminating half cores, and welding upper arc plates; 4. cutting two end bevels; 5. assembling core end plates; 6. core assembling, welding core pulling ears, and detecting core air gaps; and 7. half core pole head beveling. The application adopts the method that the punching sheet is first laminated into bonding end plates, then the bonding end plates are combined, and quarter cores and half cores are gradually laminated; arc plates are welded when the quarter cores and the half cores are combined, so that the integrity of the core is ensured; finally, the linear cutting method is adopted to cut the two end bevels, so that the core included angle of 44 degrees is ensured. The manufacturing process of the large-curvature punching sheet dipole magnet core can ensure the manufacturing precision of the core and improve the manufacturing efficiency.

Description

Technical Field

[0001] This invention belongs to the field of particle accelerator technology, specifically relating to a manufacturing process for a large curvature lamination dipole magnet core. Background Technology

[0002] Dipole electromagnets are indispensable magnetic components in particle accelerator devices, their main function being to generate a uniform magnetic field to deflect the beam. The Proton Displacement Damage Effect Simulation Facility (PREF) in China is currently the only facility in the world capable of continuously and accurately providing high-quality monoenergetic proton beams with a wide fluence range of 10-60 MeV. The dipole magnets controlling beam deflection in this facility are four large-curvature lamination dipole magnets. These magnets are fan-shaped, with a deflection radius of 950 mm, a deflection angle of 44 degrees, and an air gap size of 45 ± 0.05 mm. The core cross-section is H-shaped; it is constructed from 0.5 mm thick silicon steel sheets, using a pure adhesive bonding structure; the lamination width is 889 mm and the height is 326 mm. The large core size, small deflection radius, large curvature, and high manufacturing precision requirements are extremely rare in the industry, making the core manufacturing process extremely difficult, and currently lacking a mature and stable manufacturing process. Summary of the Invention

[0003] This invention provides a manufacturing process for large curvature lamination dipole magnet cores, with the aim of providing a mature and stable manufacturing process for large curvature lamination dipole magnet cores.

[0004] Therefore, the present invention adopts the following technical solution: A manufacturing process for a large curvature lamination diode magnet core, wherein the diode magnet core includes an upper half core and a lower half core that are symmetrically arranged vertically. The upper half core includes a left quarter core and a right quarter core that are symmetrically arranged horizontally. The left quarter core includes three parts from left to right: a first bonding end plate, a second bonding end plate, and a third bonding end plate. Similarly, the right quarter core includes a fourth bonding end plate, a fifth bonding end plate, and a sixth bonding end plate from right to left. The first and fourth bonding end plates, the second and fifth bonding end plates, and the third and sixth bonding end plates are arranged symmetrically. The lower half of the iron core is symmetrical to the upper half of the iron core, including the corresponding left quarter iron core and right quarter iron core, as well as the first bonding end plate, the second bonding end plate, the third bonding end plate, the fourth bonding end plate, the fifth bonding end plate and the sixth bonding end plate; After the bonding end plates are assembled into a quarter core, an outer arc plate is installed on the back and an inner arc plate is installed on the inside; after the quarter core is assembled into a half core, an upper arc plate is installed on the top surface for fixation, and the upper arc plate is welded for fixation; the upper half core and the lower half core are fixed together as one unit by tie rods. The manufacturing process of the polar magnet core includes the following steps: 1) Overlap the first bonding end plate and the fourth bonding end plate The first and fourth bonding end plates have large curvatures, so they are stacked by laying the stamped sheets flat. The stacking method for the first bonding end plate is as follows: First, assemble the stacking mold. Install two fixed backing plates on the base plate, controlling the perpendicularity between the fixed backing plates and the base plate to be no more than 0.05mm. Install the inner arc backing plate, and use a template to check the contour of the inner arc backing plate. The contour should not exceed 0.1mm. Position the fixed backing plate and the inner arc backing plate to the base plate with pins. Stack the stamped sheets to the required thickness, and knock the stamped sheets together from the movable backing plate side and the outer arc side. Install the movable backing plate and the outer arc backing plate. Install the cover plate and tie rod to tighten, and place in an oven for curing. The stacking method of the fourth bonding end plate is the same as that of the first bonding end plate, and the positioning surface of the fourth bonding end plate is the same as that of the first bonding end plate. 2) Overlap the second, third, fifth, and sixth bonding end plates. The second, third, fifth, and sixth bonding end plates are stacked vertically using a lamination stacking method. The stacking method for the second bonding end plate is as follows: First, assemble the stacking mold. Install the pads and fixed backing plates on the base plate, ensuring the perpendicularity between the fixed backing plates and the pads does not exceed 0.05mm. Install the inner arc positioning blocks and outer arc fixing blocks, and use a template to check the spacing and contour of the inner arc positioning blocks and outer arc fixing blocks. Position the fixed backing plates, inner arc positioning blocks, and outer arc fixing blocks to the base plate with pins. Stack the laminations to the required thickness, and knock them together from the top and outer arc sides. Install the movable backing plate, cover plate, tie rod, and top pressing fixture, tighten them, and place them in an oven for curing. The fifth bonding end plate is stacked in the same way as the second bonding end plate, and the positioning surface of the fifth bonding end plate is the same as that of the second bonding end plate; the sixth bonding end plate is stacked in the same way as the third bonding end plate, and the positioning surface of the sixth bonding end plate is the same as that of the third bonding end plate. 3) Quarter-core stacking: Quarter-core iron cores are stacked on a stacking machine. The stacking method for the left quarter core is as follows: First, assemble the stacking fixture. Install the first wedge block on the fixed end of the stacking machine and spot weld it to prevent movement during pressing. Install the pad strip, inner arc positioning block, and outer arc fixing block on the stacking machine bed. Use a template to check the spacing and contour of the inner arc positioning block and outer arc fixing block. Position the inner arc positioning block and outer arc fixing block with pins. Sequentially hoist the first bonding end plate, the second bonding end plate, and the third bonding end plate, and check the gap between the bonding end plate and the inner arc positioning block. Use the top pressing fixture to press the bonding end plate, and check the gap between the bonding end plate and the pad strip. Hoist the second wedge block, press it with the press, and measure the length of the left quarter core. Install the inner arc plate and the outer arc plate, and weld the inner arc plate and the outer arc plate to each bonding end plate as one piece. Artificial aging treatment is performed during the welding process. The right quarter core stacking fixture is symmetrical with the left quarter core stacking fixture to ensure that the positioning surfaces of the left quarter core and the right quarter core are consistent during stacking. 4) Semi-core stacking: Semi-cores are stacked on a stacking fixture; Install pads and inner and outer arc positioning blocks on the platform of the stacking fixture. Use a template to check the spacing and contour of the inner and outer arc positioning blocks. Position the inner and outer arc positioning blocks with pins. Hoist the left and right quarter cores. Weld temporary lugs to the inner and outer arc plates of the left and right quarter cores. Press the semi-cores together with the temporary lugs and the transverse clamping fixture. Check the gap between the semi-cores and the inner arc positioning blocks. Install the upper arc plate and press the semi-cores together with the top clamping fixture. Check the gap between the semi-cores and the pads. Weld the joints between the left and right quarter cores and the inner and outer arc plates. Weld the weld between the upper arc plate and the semi-cores. Perform artificial aging treatment during welding. Remove the temporary lugs after welding. 5) Cut a 44-degree angled bevel. Cut the left and right end faces of the half-core, forming a 44-degree angle between the end faces; 6) Based on the mounting hole positions on the core end plate, make mounting holes on the lamination stack and install the core end plate; Install core lifting lugs on the upper core and weld magnetic pads on the lower core; assemble the upper and lower cores and weld core pull lugs; check the air gap of the core; make saddle pin holes and install saddle pins. Disassemble into half-cores, bevel them according to the drawings, and then paint them.

[0005] Further, in step 5), on the CNC machine tool, with the half-core pole head facing upwards, the pole head surface is leveled, the half-core is aligned, and a line is etched at a 44-degree angle as a reference for subsequent wire cutting; the inner side of the etched line is milled for alignment reference during subsequent slant cutting; several short welds are welded on both sides of the pole head at the etched line to reinforce the pole head and prevent the pole head from scattering after wire cutting; wire cutting is performed according to the etched line; after cutting, the reinforcing welds on both sides of the pole head are ground smooth.

[0006] Furthermore, the maximum chord length on the outer arc side of the diode magnet core is 1590mm, the thickness of the first and fourth bonding end plates is 190mm; the thickness of the second and fifth bonding end plates is 260mm; and the thickness of the third and sixth bonding end plates is 350mm.

[0007] The processing principle of this invention is as follows: 1. The magnet has a very small bending radius. In order to ensure the dimensional accuracy and stacking coefficient of the iron core, the half iron core is decomposed into several left-right symmetrical bonding end plates. By combining them in stages, they are stacked on different stacking fixtures and equipment, which effectively reduces the manufacturing difficulty of the iron core.

[0008] 2. The half-core is symmetrical from left to right. Therefore, when stacking, the first consideration is to decompose the half-core into two symmetrical halves, namely the quarter-core. For the quarter-core, the curvature of the core increases towards the end. Therefore, the quarter-core is further divided into three types of bonding end plates with different thicknesses.

[0009] 3. The iron core is fan-shaped with an included angle of 44 degrees, the magnet deflection radius is 950mm, and the maximum chord length on the outer arc side is 1590mm. Therefore, the three bonding end plates of the quarter iron core are: the first bonding end plate with a thickness of 190mm; the second bonding end plate with a thickness of 260mm; and the third bonding end plate with a thickness of 350mm. The total length of the stacked half iron core is 1600mm, which provides sufficient machining allowance for the subsequent processing of the two end faces.

[0010] 4. The second and third bonding end plates are stacked in the form of vertically placed stamped sheets. In order to reduce the radial component of the clamping force during stacking, the backing plate and the tie rod of the stacking fixture are designed to be at a 65-degree angle. However, the first bonding end plate, through simulation on the three-dimensional design software, cannot be stacked in the same way as the second and third bonding end plates. It can only be stacked in the form of flatly placed stamped sheets.

[0011] 5. When bonding end plates are stacked, the laminations are positioned on the stacking fixture by the lower end face (i.e., the mating surface of the upper and lower half cores) and the inner arc side. Therefore, during pressing, the laminations are subjected to frictional resistance from the positioning strips of the stacking fixture. The side of the bonding end plate near the movable backing plate of the stacking fixture will have a deviation in perpendicularity to the bottom surface (i.e., the positioning surface). This deviation will cause a large gap to be generated at the mating surface when assembling the quarter core and half core in the future, if the mating surfaces of two adjacent bonding end plates are both on the movable backing plate side. Therefore, when designing the stacking fixture, all bonding end plates are fixed with the side closest to the center of the half core as the fixed backing plate surface; at the same time, symmetrical fixtures are designed for the left and right symmetrical bonding end plates.

[0012] 6. In order to ensure the length of the semi-core after the step-by-step assembly, a margin of 2-3mm was added to each bonding end plate during the stacking and bonding process. After the bonding end plates are cured at high temperature, they are peeled off to achieve the designed thickness.

[0013] 7. The inner, outer and upper arc plates on the semi-core only reinforce the core on three outer surfaces. To prevent the laminations at the pole head position from cracking during wire cutting, the laminations at the pole head position near the wire cutting position are welded and fixed before wire cutting. After cutting, the weld points are ground.

[0014] The beneficial effects of this invention are as follows: 1. The semi-core is decomposed into several bonded end plates, which are then stacked in sections and then combined step by step. This reduces the difficulty of core manufacturing while ensuring the stacking coefficient of the core. 2. Depending on the curvature, different stacking methods are used for the bonding end plates. The first and fourth bonding end plates are stacked flat with the punches, while the second, third, fifth, and sixth bonding end plates are stacked vertically with the punches. This helps to ensure the dimensional accuracy of each bonding end plate after stacking. 3. The half-core has an axisymmetric structure. Therefore, the stacking fixtures for the bonding end plates are designed separately according to left and right symmetry to ensure that the positioning surface direction is consistent when assembling the quarter-core and half-core in the later stage, thereby reducing the gap at the joint surface. 4. The backing plate and the tie rod of the second, third, fifth and sixth bonding end plate stacking fixture are designed with an acute angle. The two ends of the quarter iron core stacking fixture are designed with wedge blocks, which effectively reduces the radial force generated during clamping and ensures the external dimensions and stacking coefficient of the bonding end plate and the quarter iron core. 5. The three bonding end plates of the quarter core are connected into a whole by inner and outer arc plates, and the left and right halves of the half core are connected into a whole by upper arc plates, which increases the overall strength of the core and ensures the stability of the overall structure. 6. After the semi-core is stacked to the required size, the included angle at both ends is wire-cut to ensure the deflection angle of the core; before wire cutting, a CNC machining center is used for leveling and scribing to ensure the accuracy of the angle. Attached Figure Description

[0015] Figure 1 This is a three-dimensional schematic diagram of the front of the large curvature lamination diode magnet core structure of the present invention; Figure 2 This is a three-dimensional schematic diagram of the back side of the large curvature lamination diode magnet core structure of the present invention; Figure 3 This is a planar schematic diagram of the large curvature lamination diode magnet core structure of the present invention; Figure 4 This is a three-dimensional schematic diagram of the upper half of the iron core of the large curvature lamination dipole magnet of the present invention; Figure 5 This is a planar schematic diagram of the upper half of the iron core of the large curvature lamination diode magnet of the present invention; Figure 6 This is a schematic diagram of the stack of large curvature lamination diode magnet laminations of the present invention; Figure 7 This is a schematic diagram showing the arrangement of the left and right quarter cores of the large curvature lamination diode magnet of the present invention. Figure 8 This is a schematic diagram of the outer arc plate of the present invention; Figure 9 This is a schematic diagram of the inner arc plate of the present invention; Figure 10 This is a schematic diagram of the structure of the first upper arc plate of the present invention; Figure 11 This is a schematic diagram showing the positions of the first, second, and third bonding end plates of the present invention; Figure 12 This is a schematic diagram of the first bonding end plate and its stacking fixture of the present invention; Figure 13 This is a schematic diagram of the second bonding end plate and its stacking fixture of the present invention; Figure 14 This is a schematic diagram of the tooling for stacking the left quarter core of the large curvature lamination diode magnet of the present invention; Figure 15 This is a schematic diagram of the tooling for stacking the upper half of the iron core of the large curvature lamination diode magnet of the present invention; Figure 3 In the middle: 1-Upper iron core, 2-Lower iron core, 3-Magnetic pad, 4-Iron core pull lug, 5-Iron core pull rod, 6-Iron core lifting lug; Figure 5 In the middle: 11-Left end plate, 12-Inner arc plate, 13-Outer arc plate, 14-Stamped sheet stack, 15-First upper arc plate, 16-Second upper arc plate, 17-Right end plate; Figure 6 Middle: 141 - Left quarter core, 142 - Right quarter core; Figure 7 In the middle: 1411-first bonding end plate, 1412-second bonding end plate, 1413-third bonding end plate, 1421-fourth bonding end plate, 1422-fifth bonding end plate, 1423-sixth bonding end plate; Figure 12 21-Base plate, 72-Outer arc backing plate, 73-Modible backing plate, 74-Fixed backing plate, 75-Cover plate, 76-Tie rod, 77-Inner arc backing plate; Figure 13 In the middle: 21-base plate, 74-fixed backing plate, 83-top pressing fixture, 84-outer arc positioning block, 85-inner arc positioning block, 74-fixed backing plate; Figure 14 In the middle: 91-Stacking machine, 92-First wedge block, 83-Top pressing tool, 85-Inner arc positioning block, 84-Outer arc positioning block, 96-Second wedge block; Figure 15 In the middle: 101-Platform, 102-Horizontal tie rod, 103-Horizontal clamping fixture, 93-Top pressing fixture, 105-Temporary pull lug, 84-Outer arc positioning block, 85-Inner arc positioning block. Detailed Implementation

[0016] The present invention will be further described below with reference to the accompanying drawings and specific embodiments: like Figures 1-3As shown, a manufacturing process for a large curvature lamination diode magnet core is described. The diode magnet core includes an upper half core 1 and a lower half core 2 that are symmetrically arranged vertically. The upper half core 1 includes a left quarter core 141 and a right quarter core 142 that are symmetrically arranged horizontally. The left quarter core 141 includes three parts from left to right: a first bonding end plate 1411, a second bonding end plate 1412, and a third bonding end plate 1413 (as shown in the image). Figure 7 The right quarter core 142 also includes a fourth bonding end plate 1421, a fifth bonding end plate 1422 and a sixth bonding end plate 1423 from right to left. The first bonding end plate 1411 and the fourth bonding end plate 1421, the second bonding end plate 1412 and the fifth bonding end plate 1422, the third bonding end plate 1413 and the sixth bonding end plate 1423 are symmetrically arranged. The lower half of the iron core 2 is symmetrical to the upper half of the iron core 1, including the corresponding left quarter core 141 and right quarter core 142 (e.g. Figure 6 ), and the first bonding end plate 1411, the second bonding end plate 1412, the third bonding end plate 1413, the fourth bonding end plate 1421, the fifth bonding end plate 1422 and the sixth bonding end plate 1423.

[0017] After the bonded end plates are assembled into a quarter core, an outer arc plate 13 is installed on the back and an inner arc plate 12 is installed on the inside; after the quarter core is assembled into a half core, an upper arc plate is installed and fixed on the top surface, and the upper arc plate is welded and fixed, wherein the upper arc plate includes a first upper arc plate 15 and a second upper arc plate 16 (e.g. Figure 5 The upper iron core 1 and the lower iron core 2 are fixed together as one unit by a tie rod.

[0018] The manufacturing process of a dipolar magnet core includes the following steps: 1) Overlapping the first bonding end plate 1411 and the fourth bonding end plate 1421 like Figure 12 As shown, the first bonding end plate 1411 and the fourth bonding end plate 1421 have large curvatures and are stacked by laying the stamped sheets flat. The stacking method of the first bonding end plate 1411 is as follows: First, the stacking mold is assembled. Two fixed backing plates 74 are installed on the base plate 21, and the perpendicularity between the fixed backing plates 74 and the base plate 21 is controlled to not exceed 0.05mm. The inner arc backing plate 77 is installed, and the contour of the inner arc backing plate 77 is checked with a template. The contour does not exceed 0.1mm. The fixed backing plate 74 and the inner arc backing plate 77 are positioned with the base plate 21 with pins. The stamped sheets are stacked to the required thickness, and the stamped sheets are knocked to align from the side of the movable backing plate 73 and the outer arc side. The movable backing plate 73 and the outer arc backing plate 72 are installed. The cover plate 75 and the pull rod 76 are installed and pressed together, and then placed in an oven for curing.

[0019] The stacking method of the fourth bonding end plate 1421 is the same as that of the first bonding end plate 1411, and the positioning surface of the fourth bonding end plate 1421 is the same as that of the first bonding end plate 1411.

[0020] 2) Overlap the second bonding end plate 1412, the third bonding end plate 1413, the fifth bonding end plate 1422, and the sixth bonding end plate 1423. like Figure 13 As shown, the second, third, fifth, and sixth bonding end plates are stacked vertically using a lamination method. The stacking method of the second bonding end plate 1412 is as follows: First, the stacking mold is assembled. A pad and a fixed backing plate 74 are installed on the base plate 21. The perpendicularity between the fixed backing plate 74 and the pad does not exceed 0.05mm. The inner arc positioning block 85 and the outer arc fixing block are installed. The spacing and contour of the inner arc positioning block 85 and the outer arc fixing block are checked with a template. The fixed backing plate 74, the inner arc positioning block 85, and the outer arc fixing block are positioned with the base plate 21 using pins. The laminations are stacked to the required thickness, and the laminations are aligned from the top and the outer arc side. The movable backing plate 73, the cover plate 75, the pull rod 76, and the top pressing fixture 83 are installed and pressed tightly. The plate is then placed in an oven for curing.

[0021] The stacking method of the fifth bonding end plate 1422 is the same as that of the second bonding end plate 1412, and the positioning surface of the fifth bonding end plate 1422 is the same as that of the second bonding end plate 1412; the stacking method of the sixth bonding end plate 1423 is the same as that of the third bonding end plate 1413, and the positioning surface of the sixth bonding end plate 1423 is the same as that of the third bonding end plate 1413.

[0022] 3) Quarter core lamination: Quarter cores are laminated on lamination machine 91. like Figure 14 As shown, the stacking method of the left quarter core 141 is as follows: First, the stacking fixture is assembled. The first wedge block 92 is installed on the fixed end of the stacking machine 91 and spot-welded to prevent movement during pressing. The pad strip, inner arc positioning block 85, and outer arc fixing block are installed on the bed of the stacking machine 91. The spacing and contour of the inner arc positioning block 85 and outer arc fixing block are checked with a template. The inner arc positioning block 85 and outer arc fixing block are positioned with pins. The first bonding end plate 1411, the second bonding end plate 1412, and the third bonding end plate 1413 are hoisted in sequence, and the gap between the bonding end plate and the inner arc positioning block 85 is checked. The bonding end plate is pressed with the top pressing fixture 83, and the gap between the bonding end plate and the pad strip is checked. The second wedge block 96 is hoisted and pressed by the press. The length of the left quarter core 141 is measured. The inner arc plate 12 and the outer arc plate 13 are installed and welded to each bonding end plate as a whole. Artificial aging treatment is performed during the welding process.

[0023] The stacking fixture for the right quarter core 142 is symmetrical with the stacking fixture for the left quarter core 141, ensuring that the positioning surfaces of the left quarter core 141 and the right quarter core 142 are consistent during stacking.

[0024] 4) Semi-core stacking: Semi-cores are stacked on a stacking fixture; like Figure 15 As shown, pads and inner arc positioning blocks 85 and outer arc positioning blocks 84 are installed on the platform of the stacking fixture. The spacing and contour of the inner arc positioning blocks 85 and outer arc positioning blocks 84 are checked with a template. The inner arc positioning blocks 85 and outer arc positioning blocks 84 are positioned with pins. The left quarter core 141 and right quarter core 142 are hoisted. Temporary lugs 105 are welded to the inner arc plates 12 and outer arc plates 13 of the left quarter core 141 and right quarter core 142. 105 and the transverse clamping fixture 103 are used to clamp and form a half-core. The gap between the half-core and the inner arc positioning block 85 is checked. The upper arc plate is installed, and the half-core is clamped with the top clamping fixture 83. The gap between the half-core and the pad is checked. The joints between the left quarter core 141 and the right quarter core 142 and the inner arc plate 12 and the outer arc plate 13 are welded. The weld between the upper arc plate and the half-core is welded. Artificial aging treatment is performed during the welding process. The temporary pull lug 105 is removed after welding.

[0025] 5) Cut a 44-degree angled bevel. Cut the left and right end faces of the semi-core, forming a 44-degree angle between the end faces; For example Figure 6 As shown, the dashed lines on the left and right sides are the positions of the tangent lines.

[0026] In step 5), on the CNC machine tool, with the half-core pole head facing upwards, the pole head surface is leveled and the half-core is aligned. A line is etched at a 44-degree angle as a reference for subsequent wire cutting. The inner side of the etched line is milled to serve as a reference for subsequent slant cutting. Several short welds are welded on both sides of the pole head at the etched line to reinforce the pole head and prevent the pole head from scattering after wire cutting. Wire cutting is performed according to the etched line. After cutting, the reinforcing welds on both sides of the pole head are ground smooth.

[0027] 6) Based on the mounting hole positions on the core end plate, make mounting holes on the lamination stack 14 and install the core end plate; Install the core lifting lug 6 on the upper core 1 and weld the magnet pad 3 on the lower core 2; combine the upper and lower cores and weld the core pull lug 4; check the air gap of the core; make the saddle pin hole and install the saddle pin. Disassemble into half-cores, bevel them according to the drawings, and then paint them.

[0028] The maximum chord length on the outer arc side of the diode magnet core is 1590mm. The thickness of the first bonding end plate 1411 and the fourth bonding end plate 1421 is 190mm; the thickness of the second bonding end plate 1412 and the fifth bonding end plate 1422 is 260mm; and the thickness of the third bonding end plate 1413 and the sixth bonding end plate 1423 is 350mm.

Claims

1. A manufacturing process for a large curvature lamination dipole magnet core, the specific details of which are as follows: characterized in that... The polar magnet core includes an upper half core (1) and a lower half core (2) that are symmetrical. The upper half core (1) includes a left quarter core (141) and a right quarter core (142) that are symmetrical. The left quarter core (141) includes three parts from left to right: a first bonding end plate (1411), a second bonding end plate (1412) and a third bonding end plate (1413). The right quarter core (142) also includes a fourth bonding end plate (1421), a fifth bonding end plate (1422) and a sixth bonding end plate (1423) from right to left. The first bonding end plate (1411) and the fourth bonding end plate (1421), the second bonding end plate (1412) and the fifth bonding end plate (1422), the third bonding end plate (1413) and the sixth bonding end plate (1423) are arranged symmetrically. The lower half core (2) is symmetrical to the upper half core (1), including the corresponding left quarter core (141) and right quarter core (142), as well as the first bonding end plate (1411), the second bonding end plate (1412), the third bonding end plate (1413), the fourth bonding end plate (1421), the fifth bonding end plate (1422) and the sixth bonding end plate (1423). After the bonding end plates are assembled into a quarter core, an outer arc plate (13) is installed on the back and an inner arc plate (12) is installed on the inside; after the quarter core is assembled into a half core, an upper arc plate is installed on the top surface for fixation, and the upper arc plate is welded and fixed; the upper half core (1) and the lower half core (2) are fixed together by a tie rod; The manufacturing process of the polar magnet core includes the following steps: 1) Overlap the first bonding end plate (1411) and the fourth bonding end plate (1421). The first bonding end plate (1411) and the fourth bonding end plate (1421) have large curvatures and are stacked by flat stacking of the stamped sheets. The stacking method of the first bonding end plate (1411) is as follows: First, the stacking mold is assembled. Two fixed backing plates (74) are installed on the base plate. The perpendicularity between the fixed backing plate (74) and the base plate is controlled to not exceed 0.05mm. The inner arc backing plate (77) is installed. The contour of the inner arc backing plate (77) is checked with a template. The contour does not exceed 0.1mm. The fixed backing plate (74) and the inner arc backing plate (77) are positioned with pins on the base plate. The stamped sheets are stacked to the required thickness. The stamped sheets are aligned from the movable backing plate (73) side and the outer arc side side. The movable backing plate (73) and the outer arc backing plate (72) are installed. The cover plate (75) and the pull rod are installed and pressed together. The sheets are then placed in an oven for curing. The stacking method of the fourth bonding end plate (1421) is the same as that of the first bonding end plate (1411), and the positioning surface of the fourth bonding end plate (1421) is the same as that of the first bonding end plate (1411). 2) Overlap the second bonding end plate (1412), the third bonding end plate (1413), the fifth bonding end plate (1422), and the sixth bonding end plate (1423). The second, third, fifth, and sixth bonding end plates are stacked by vertically stacking the punched sheets. The stacking method of the second bonding end plate (1412) is as follows: First, the stacking mold is assembled. The base plate is installed with a pad and a fixed backing plate (74). The perpendicularity between the fixed backing plate (74) and the pad does not exceed 0.05mm. The inner arc positioning block (85) and the outer arc fixing block are installed. The spacing and contour of the inner arc positioning block (85) and the outer arc fixing block are checked with a template. The fixed backing plate (74), the inner arc positioning block (85), and the outer arc fixing block are positioned with the base plate with pins. The punched sheets are stacked to the required thickness. The punched sheets are knocked together from the top and the outer arc side. The movable backing plate (73), the cover plate (75), the pull rod, and the top pressing fixture (83) are installed and pressed. The sheets are then placed in an oven for curing. The stacking method of the fifth bonding end plate (1422) is the same as that of the second bonding end plate (1412), and the positioning surface of the fifth bonding end plate (1422) is the same as that of the second bonding end plate (1412); the stacking method of the sixth bonding end plate (1423) is the same as that of the third bonding end plate (1413), and the positioning surface of the sixth bonding end plate (1423) is the same as that of the third bonding end plate (1413); 3) Quarter core stacking: Quarter cores are stacked on the stacking machine (91). The stacking method of the left quarter iron core (141) is as follows: First, the stacking fixture is assembled. The first wedge block (92) is installed on the fixed end of the stacking machine (91) and spot welded to prevent movement during pressing. The pad strip, inner arc positioning block (85), and outer arc fixing block are installed on the bed surface of the stacking machine (91). The spacing and contour of the inner arc positioning block (85) and outer arc fixing block are checked with a template. The inner arc positioning block (85) and outer arc fixing block are positioned with pins. The first bonding end plate (1411) and the second bonding end plate are hoisted in sequence. End plate (1412) and third bonding end plate (1413), check the gap between the bonding end plate and the inner arc positioning block (85); use top pressing fixture (83) to press the bonding end plate, check the gap between the bonding end plate and the pad strip; hoist the second wedge block (96), press it with the press, measure the length of the left quarter iron core (141); install the inner arc plate (12) and outer arc plate (13), weld the inner arc plate (12) and outer arc plate (13) to each bonding end plate as one piece, and perform artificial aging treatment during the welding process; The stacking fixture for the right quarter core (142) is symmetrical with the stacking fixture for the left quarter core (141) to ensure that the positioning surfaces of the left quarter core (141) and the right quarter core (142) are consistent during stacking. 4) Semi-core stacking: Semi-cores are stacked on a stacking fixture; Pad strips and inner arc positioning blocks (85) and outer arc positioning blocks (84) are installed on the platform of the stacking fixture. The spacing and contour of the inner arc positioning blocks (85) and outer arc positioning blocks (84) are checked with a template. The inner arc positioning blocks (85) and outer arc positioning blocks (84) are positioned with pins. The left quarter core (141) and right quarter core (142) are hoisted. Temporary pull lugs are welded on the inner arc plates (12) and outer arc plates (13) of the left quarter core (141) and right quarter core (142). The semi-core is formed by pressing it with a temporary pull lug and a transverse clamping fixture (103), and the gap between the semi-core and the inner arc positioning block (85) is checked; the upper arc plate is installed, and the semi-core is pressed with a top clamping fixture (83), and the gap between the semi-core and the pad strip is checked; the joints between the left quarter core (141) and the right quarter core (142) and the inner arc plate (12) and the outer arc plate (13) are welded, and the weld between the upper arc plate and the semi-core is welded. Artificial aging treatment is performed during the welding process; the temporary pull lug is removed after welding. 5) Cut a 44-degree angled bevel. Cut the left and right end faces of the half-core, forming a 44-degree angle between the end faces; 6) According to the mounting hole position on the iron core end plate, make mounting holes on the lamination stack (14) and install the iron core end plate; install iron core lifting lugs on the upper iron core (1) and weld magnet pads (3) on the lower iron core (2); combine the upper and lower iron cores and weld iron core pull lugs (4); check the iron core air gap; make saddle pin holes and install saddle pins; Disassemble into half-cores, bevel them according to the drawings, and paint them. The magnet has a deflection radius of 950 mm, a maximum chord length of 1590 mm on the outer arc side of the dipole magnet core, a thickness of 190 mm for the first bonding end plate (1411) and the fourth bonding end plate (1421), a thickness of 260 mm for the second bonding end plate (1412) and the fifth bonding end plate (1422), a thickness of 350 mm for the third bonding end plate (1413) and the sixth bonding end plate (1423), and a total length of 1600 mm for the stacked half core.

2. The manufacturing process for a large curvature lamination diode magnet core according to claim 1, characterized in that, In step 5), on the CNC machine tool, with the half-core pole head facing upwards, the pole head surface is leveled and the half-core is aligned. A line is etched at a 44-degree angle as a reference for subsequent wire cutting. The inner side of the etched line is milled to serve as a reference for subsequent slant cutting. Several short welds are welded on both sides of the pole head at the etched line to reinforce the pole head and prevent the pole head from scattering after wire cutting. Wire cutting is performed according to the etched line. After cutting, the reinforcing welds on both sides of the pole head are ground smooth.

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