A fabrication process for the skeleton of a superconducting arc-shaped inclined solenoid CCT and DCT

Abstract

This invention discloses a manufacturing process for the skeleton of superconducting arc-shaped inclined solenoids CCT and DCT. The CCT and DCT skeletons have the same arc radius and the same outer and inner diameters of the cross-sectional circular tubes. The arc radius of the skeleton is R1, the outer diameter of the cross-sectional circular tube is ΦQ, and the inner diameter of the cross-sectional circular tube is Φq. The central angle of the CCT skeleton is Q°, and the angle between the inclined groove and the horizontal plane is E°. The central angle of the DCT skeleton is W°, and the outer surface of the DCT skeleton is provided with an annular racetrack-shaped groove. The manufacturing process includes: 1) fabrication of the G10 tube of the CCT and DCT skeletons; 2) machining and installation of CCT and DCT tooling; 3) installation and positioning of the G10 tube; 4) rough machining of the G10 tube; 5) fine machining of the CCT skeleton G10 tube; 6) fine machining of the DCT skeleton G10 tube.

Description

Technical Field

[0001] This invention belongs to the field of processing technology, specifically relating to a skeleton processing and manufacturing process for superconducting arc-shaped inclined solenoid CCT and DCT. Background Technology

[0002] The Canted Cosine Theta (CCT) superconducting deflection magnet is a core component of the superconducting synchrotron and superconducting Gantry in next-generation miniaturized heavy ion therapy devices. The CCT-type superconducting coil is a novel coil structure that achieves the desired magnetic field distribution by controlling the spatial curve and end structure. For this type of coil, technical challenges such as the precision of the slot machining, assembly and support, the forming and machining of the arc-shaped skeleton, the application of interlayer prestress, and vacuum curing are all crucial to the magnet's development. This component is difficult to manufacture, and currently, mature and reliable processing techniques are lacking.

[0003] One existing process uses stainless steel bent tubes, CNC precision machining of the outer diameter, followed by edge winding with glass fiber ribbon using a five-axis winding machine and epoxy curing. Then, CNC milling and turning is used to machine the outer diameter of the CCT and DCT skeleton arc surfaces and the coil grooves, and superconducting wires are wound. This process is repeated for the second layer, and so on for the third and fourth layers. This process has the following problems: as the number of coils increases and the diameter grows, the milling and turning process exceeds the tolerance of the equipment's travel; the weight increases, and due to the eccentricity of the bent tube's center of gravity, assembly on the milling and turning machine becomes difficult; the added wiring between each layer of superconducting wires increases the risk of superconductivity failure; and the entire production process of a superconducting coil requires waiting for the previous process to be completed before proceeding to the next, severely restricting mass production efficiency. Summary of the Invention

[0004] This invention provides a skeleton processing and manufacturing process for superconducting arc-shaped inclined solenoids (CCT and DCT). The purpose is to provide a more mature and reliable skeleton processing and manufacturing process for CCT and DCT, so as to reduce the number of joints between layers and reduce the risk of quench failure; and to solve the problem of overtravel and difficulty in processing when the wire groove skeleton is increased.

[0005] Therefore, the present invention adopts the following technical solution:

[0006] A manufacturing process for the skeleton of a superconducting arc-shaped inclined solenoid CCT and DCT, wherein the CCT and DCT skeletons have the same arc radius and the same outer and inner diameters of the cross-sectional circular tube; the arc radius of the skeleton is R1, the outer diameter of the cross-sectional circular tube is ΦQ, and the inner diameter of the cross-sectional circular tube is Φq; the central angle of the CCT skeleton is Q°, and the angle between the inclined groove and the horizontal plane is E°; the central angle of the DCT skeleton is W°, and the outer surface of the DCT skeleton is provided with an annular racetrack-shaped groove; characterized in that the manufacturing process includes the following steps:

[0007] 1) Fabrication of G10 skeleton tubes for CCT and DCT

[0008] The G10 pipe blank was cast according to the design requirements. A soft mold with internal heating and internal expansion was used, with external positioning on the outer metal mold. The pipe was formed by injection molding using a method of layering fiberglass cloth, ensuring the arc radius R1 of the G10 pipe. Precision, pipe diameter ΦA0 +0.2 The accuracy meets the design requirements;

[0009] 2) CCT and DCT tooling processing and installation

[0010] = 1 * GB3 * MERGEFORMAT ① In the first set of tooling ( Figure 4 As shown, three positioning arc plates are machined on the surface, and circular arc positioning grooves are designed and machined on the upper surface of the positioning arc plates; the radius of the arc positioning grooves is R1. The diameter of the arc-shaped positioning groove cross-section is ΦQ The central angle is less than 180°; several vertical screw holes are opened on both sides of the positioning arc plate positioning groove; serving as the reference for the first semi-finishing;

[0011] = 2 * GB3 * MERGEFORMAT ② In the second set of tooling ( Figure 4 As shown, machine arc-shaped positioning grooves on three positioning arc plates, with an arc radius of R1. The diameter of the arc-shaped positioning groove cross-section is ΦQ The positioning arc plate has several vertical screw holes on both sides of the positioning groove; an angle positioning block is designed and machined at one end of the angle Q±0.01° or W±0.01° to ensure that the error is no more than 0.01°, which serves as the precision machining reference for the end positioning.

[0012] Each positioning arc plate is sequentially positioned on the tooling base plate and then fixed together to the machining table of the machine tool; such as Figure 4 As shown;

[0013] 3) Semi-finishing of G10 pipe

[0014] Install the blank G10 tube from step 1) horizontally onto the first fixture in step 2). Roughly align the blank G10 tubes symmetrically into the arc positioning grooves of the fixture. Use a dial indicator to roughly check that the symmetry is within 0.15mm of the inner arc and the relevant lines at both ends. Fill the gaps between the unsupported portions of the blank G10 tubes with plaster to prevent vibration during processing. Then install V-shaped pressure plates to press the blank G10 tubes firmly. Install two V-shaped pressure plates on each base plate. The radius of the processed arc is R1. The diameter of the arc is ΦQ The angle is Q±0.01° or W±0.01°; then, the positioning planes M and N are machined on the G10 tube without oblique helices at both ends, which serve as the alignment datum for clamping the part after it has been rotated 180° (see...). Figure 1 and Figure 2 The DCT coil frame has a racetrack-shaped groove, so it's designed as a flat surface in the middle. During the finishing of the curved surface, it's machined as a flat surface to serve as a reference for part alignment. The CCT coil frame is machined at both ends as follows... Figure 1 Reference points M and N are shown.

[0015] 4) Machining of the arc surface of G10 pipe

[0016] To finish the outer diameter of the upper semicircular surface of the G10 tube, install the G10 tube on the second set of fixtures. When the machining path of the machine tool head approaches the V-shaped clamping plate, remove the V-shaped clamping plate. After the machining path of the machine tool head passes through, reinstall the V-shaped clamping plate. Repeat this process of removing and installing each V-shaped clamping plate along the machining path until the outer diameter ΦQ of the upper semicircular surface of the G10 tube is finished. The radius of the arc of the positioning groove is R1. Next, machine the Q±0.01° or W±0.01° angle of the G10 tube to the dimensions shown in the drawing, controlling the angle tolerance to be no greater than ±0.01°; repeat step 4) once, remove the V-shaped pressure plate, rotate the G10 tube 180° and insert it into the arc positioning groove of the tooling, and finish machine the outer diameter of the other half of the arc surface to ΦQ. The G10 tube is fitted with an angle of Q° or W° to the angle positioning plate, with a 0.02 feeler gauge not allowed to enter; this ensures a repeatability error of less than 0.04; the outer diameter of the other half of the G10 tube's arc surface is precision machined to the required size; (Note that during the alignment process, the gap can be adjusted using a 0.02 feeler gauge)

[0017] 5) Precision machining of CCT skeleton G10 tube

[0018] = 1 \* GB3① Install the G10 tube with a central angle of Q°, which has been rough-machined in step 4), onto the tooling in step 2). Control one end face of the G10 tube to coincide with the side of the adjacent positioning block, ensuring that the 0.02mm feeler gauge does not slip in. Then use a U-shaped pressure plate to press the G10 tube tightly. Ensure that the positioning error of the G10 tube in the finishing process does not exceed 0.05. It is necessary to set some points on the computer 3D model and measure them on the CNC machine tool to ensure that the error is within 0.05 before starting the machining. Use plaster to padded the part to prevent vibration during machining, which would affect the surface finish of the part.

[0019] = 2 \* GB3② Machining the inclined helical groove with an angle of E° on the upper semicircular surface to the size required by the drawing; when the machining path of the machine tool head approaches the U-shaped pressure plate, remove the U-shaped pressure plate, and reinstall the U-shaped pressure plate after the machining path of the tool head passes through; disassemble and install each U-shaped pressure plate on the machining path in sequence until the machining of the inclined helical groove on the upper semicircular surface of the G10 tube is completed.

[0020] = 3 \* GB3③ Remove the U-shaped pressure plate, rotate the G10 tube 180° and install it into the arc positioning groove of the tooling, then perform the clamping and alignment in step ①, controlling the alignment error to be less than 0.03mm; follow step ② to complete the finishing of the other half of the arc surface and the machining of the inclined spiral groove; (when machining the upper and lower half of the spiral, the machining groove needs to pass through the semicircle by 180° and 1 tool diameter)

[0021] 6) Precision machining of DCT skeleton G10 tube

[0022] For the DCT skeleton finishing process, select the G10 tube with a central angle of W° that has been rough-machined in step 4). The finishing process steps for the outer diameter of the upper half of the DCT skeleton G10 tube are the same as those for the CCT skeleton G10 tube. After the upper half of the outer diameter of the DCT skeleton G10 tube is finished, machine the annular track groove to the dimensions in the drawing according to the drawing requirements. Remove the U-shaped pressure plate, rotate the G10 tube 180° and install it into the arc positioning groove of the tooling, re-clamp and align it, and machine the outer diameter of the other half of the G10 tube and the annular track groove.

[0023] Furthermore, in step 6), after the outer diameter of the upper semicircular surface of the G10 tube is finished, several positioning holes are opened on the center line of the top surface of the G10 tube; when processing the annular track groove, the U-shaped pressure plate is removed, and an arc-shaped horizontal pressure plate is installed on the top surface of the G10 tube through the positioning holes.

[0024] Furthermore, step 4) rough machining of the G10 pipe uses a CNC three-axis machining center.

[0025] Furthermore, in step 5), the CCT skeleton G10 tube finishing process is performed using a CNC five-axis machining center.

[0026] Furthermore, in step 6), the DCT skeleton G10 tube is precision machined using a CNC five-axis gantry machining center.

[0027] The beneficial effects of this invention are as follows:

[0028] 1. The G10 tube blanks for CCT and DCT of the present invention adopt soft mold heating and internal expansion, and metal mold external positioning to control the tolerance accuracy of the inner diameter of G10 tubes. The tubes are formed by injection molding using glass fiber cloth stacking. This reduces the process difficulty of processing the inner diameter and achieves a process breakthrough in multi-layer nested installation.

[0029] 2. This invention employs a CNC three-axis machining center for rough machining of the outer diameter and a CNC five-axis machining center for finish machining of the CCT inclined spiral groove skeleton and the DCT annular raceway groove skeleton, thereby improving the feasibility of machining processes for various models and specifications. It avoids the problems of interference between the spindle head, cutting tools, etc., and the parts when machining larger specifications of CCT and DCT G10 skeletons due to the limitation of the turning diameter of the turning and milling composite five-axis machining center, and the waste caused by the need to purchase a larger model turning and milling composite five-axis machining center. Therefore, this invention has greater production flexibility, can realize product development more economically, and reduces the risks and cost control in the development process.

[0030] 3. The G10 skeleton of CCT and DCT processed by this invention ensures the accuracy of the pipeline and provides a benchmark for the subsequent assembly of G10 pipelines of CCT and DCT. It avoids the original winding process, which involves winding superconducting wire after processing, and then repeating the process multiple times on CNC five-axis machining. This increases the tooling cost and risk in the subsequent processing. If there is a problem with the superconducting wire at any stage, the entire coil will be scrapped. Compared with the original process, this invention has significant improvements and can be mass-produced, and is more economical.

[0031] 4. The G10 wire groove skeleton of CCT and DCT processed by this invention can be inspected before casting to ensure that each superconducting connection meets the design requirements before proceeding with the subsequent casting process, thereby reducing the scrap rate and improving product quality. Attached Figure Description

[0032] Figure 1 This is a schematic diagram of the CCT skeleton G10 tube of the present invention;

[0033] Figure 2 This is a schematic diagram of the DCT skeleton G10 tube of the present invention;

[0034] Figure 3 This is a schematic diagram of the casting blank of the CCT and DCT skeleton G10 tube of the present invention;

[0035] Figure 4 This is a rough machining schematic diagram of the G10 tube for the CCT and DCT skeleton of this invention;

[0036] Figure 5 This is a schematic diagram of the machining of the 1 / 3 oblique helical groove at the right end of the CCT skeleton G10 tube of the present invention;

[0037] Figure 6 This is a schematic diagram of the machining of the 1 / 3 oblique helical groove in the middle of the CCT skeleton G10 tube of the present invention;

[0038] Figure 7 This is a schematic diagram of the machining of the 1 / 3 oblique helical groove at the left end of the CCT skeleton G10 tube of the present invention;

[0039] Figure 8 This is a schematic diagram of the on-site test results of the CCT skeleton of the present invention. Detailed Implementation

[0040] The present invention will be further described below with reference to the accompanying drawings:

[0041] A fabrication process for the skeleton of a superconducting arc-shaped inclined solenoid CCT and DCT, wherein the CCT skeleton is as follows: Figure 1 As shown, the DCT skeleton is as follows Figure 2 As shown. The CCT and DCT skeletons have the same arc radius, and the outer and inner diameters of the cross-sectional circular tubes are the same; the arc radius of the skeleton is R1, the outer diameter of the cross-sectional circular tube is ΦQ, and the inner diameter of the cross-sectional circular tube is Φq; the central angle of the CCT skeleton is Q°, and the angle between the inclined groove and the horizontal plane is E°; the central angle of the DCT skeleton is W°, and the outer surface of the DCT skeleton is provided with an annular racetrack-shaped groove.

[0042] The fabrication process of the skeleton of superconducting arc-shaped inclined solenoid CCT and DCT includes the following steps:

[0043] 1) Fabrication of G10 skeleton tubes for CCT and DCT

[0044] The G10 pipe blank was cast according to the design requirements. The pipe manufacturing process employed a soft mold heating and internal expansion method, with external positioning using a metal outer mold. The pipe was formed by injection molding using a method of layering fiberglass cloth, ensuring the G10 bend radius R1. Precision, pipe diameter ΦA0 +0.2 The accuracy meets the design requirements;

[0045] 2) CCT and DCT tooling processing and installation

[0046] = 1 * GB3 * MERGEFORMAT ① In the first set of tooling ( Figure 4 As shown, three positioning arc plates are machined on the surface, and circular arc positioning grooves are designed and machined on the upper surface of the positioning arc plates; the radius of the arc positioning grooves is R1. The diameter of the arc-shaped positioning groove cross-section is ΦQ The central angle is less than 180°; several vertical screw holes are opened on both sides of the arc positioning groove of the positioning arc plate; serving as the reference for the first semi-finishing.

[0047] = 2 * GB3 * MERGEFORMAT ② In the second set of tooling ( Figure 4 As shown, machine arc-shaped positioning grooves on three positioning arc plates, with an arc radius of R1. The diameter of the arc-shaped positioning groove cross-section is ΦQ The positioning arc plate has several vertical screw holes on both sides of the arc positioning groove; an angle positioning block is designed and machined at one end of the angle Q±0.01° or W±0.01° to ensure that the error is not greater than 0.01°, which serves as the precision machining reference for end positioning;

[0048] Position each positioning arc plate sequentially onto the tooling base plate, and then fix them together onto the machining table of the machine tool; for example Figure 4 As shown;

[0049] 3) Semi-finishing of G10 pipe

[0050] Install the blank G10 tube from step 1) horizontally onto the first fixture in step 2). Roughly align the blank G10 tube and symmetrically insert it into the arc positioning groove of the fixture. Roughly calibrate the symmetry using a dial indicator. Ensure the inner arc and the relevant lines at both ends are within 0.15mm. Fill the gaps between the unsupported portions of the blank G10 tube with plaster to prevent vibration during machining. Then install V-shaped pressure plates to press the blank G10 tube firmly. Install two V-shaped pressure plates on each positioning arc plate. The machining arc radius is R1. The diameter of the arc is ΦQ The angle is Q±0.01° or W±0.01°; then, positioning planes M and N are machined at both ends of the CCT skeleton G10 tube, which serve as the alignment datum for clamping the part after it has been flipped 180° (see...). Figure 1 and Figure 2 );

[0051] The DCT skeleton has a racetrack-shaped groove, and the middle position of the racetrack is designed as a plane. When finishing the arc surface of the DCT skeleton, the center of the annular racetrack groove of the DCT skeleton G10 tube is machined into a plane. This plane serves as the precision reference for aligning the DCT skeleton G10 tube after it has been rotated 180°.

[0052] The CCT coil frame is machined at both ends as follows: Figure 1 Reference points M and N are shown.

[0053] 4) Machining of the arc surface of G10 pipe

[0054] To finish the outer diameter of the upper semicircular surface of the G10 tube, install the G10 tube on the second set of fixtures. When the machining path of the machine tool head approaches the V-shaped clamping plate, remove the V-shaped clamping plate. After the machining path of the machine tool head passes through, reinstall the V-shaped clamping plate. Repeat this process of removing and installing each V-shaped clamping plate along the machining path until the outer diameter ΦQ of the upper semicircular surface of the G10 tube is finished. The radius of the arc of the positioning groove is R1. Next, machine the Q±0.01° or W±0.01° angle of the G10 tube to the dimensions shown in the drawing, controlling the angle tolerance to be no greater than ±0.01°; repeat step 4) once, remove the V-shaped pressure plate, rotate the G10 tube 180° and insert it into the arc positioning groove of the tooling, and finish machine the outer diameter of the other half of the arc surface to ΦQ. The G10 tube is fitted with an angle of Q° or W° to the angle positioning plate, with a 0.02mm feeler gauge not allowed to pass through; this ensures a repeatability error of less than 0.04; the outer diameter of the other half of the G10 tube's arc surface is precision machined to the required size; (Note that during the alignment process, the gap can be adjusted using a 0.02mm feeler gauge)

[0055] 5) Precision machining of CCT skeleton G10 tube

[0056] = 1 \* GB3① Install the G10 tube with a central angle of Q°, which has been rough-machined in step 4), onto the tooling in step 2). Control one end face of the G10 tube to coincide with the side of the adjacent positioning block, ensuring that the 0.02mm feeler gauge does not slip in. Then use a U-shaped pressure plate to press the G10 tube tightly. Ensure that the positioning error of the G10 tube in the finishing process does not exceed 0.05mm. Some points need to be measured on the computer 3D model on the CNC machine tool to ensure that the error is within 0.05mm before starting the machining. Use plaster to padded the parts to prevent vibration during machining, which would affect the surface finish of the parts.

[0057] = 2 \* GB3② Machining the inclined helical groove with an angle of E° on the upper semicircular surface to the size required by the drawing; when the machining path of the machine tool head approaches the U-shaped pressure plate, remove the U-shaped pressure plate, and reinstall the U-shaped pressure plate after the machining path of the tool head passes through; disassemble and install each U-shaped pressure plate on the machining path in sequence until the machining of the inclined helical groove on the upper semicircular surface of the G10 tube is completed.

[0058] = 3 \* GB3③ Remove the U-shaped pressure plate, rotate the G10 tube 180° and install it into the tooling arc positioning groove, then perform the clamping and alignment in step ①, controlling the alignment error to be less than 0.03mm; follow step ② to complete the finishing of the other half of the arc surface and the machining of the inclined spiral groove (when machining the upper and lower half of the spiral, the machining groove needs to pass through the semicircle 180° by 1 tool diameter).

[0059] 6) Precision machining of DCT skeleton G10 tube

[0060] For the DCT skeleton finishing process, select the G10 tube with a central angle of W° that has been rough-machined in step 4). The finishing process steps for the outer diameter of the upper half of the DCT skeleton G10 tube are the same as those for the CCT skeleton G10 tube. After the upper half of the outer diameter of the DCT skeleton G10 tube is finished, machine the annular track groove to the dimensions in the drawing according to the drawing requirements. Remove the U-shaped pressure plate, rotate the G10 tube 180° and install it into the arc positioning groove of the tooling, re-clamp and align it, and machine the outer diameter of the other half of the G10 tube and the annular track groove.

[0061] Significant progress has been made in the development of the Canted Cosine Theta (CCT) superconducting magnet, marking the first successful development of this type of superconducting magnet in China and the first time globally that a 90° deflection magnet of this type has been developed. After more than a year of dedicated research and development, the magnet underwent cryogenic testing in liquid helium on August 23, 2022. During the test, after undergoing quench testing, the magnet reached the designed current of 610A and generated a magnetic field strength of 2T, perfectly matching the design value.

Claims

1. A manufacturing process for the skeleton of a superconducting arc-shaped inclined solenoid CCT and DCT, wherein the CCT and DCT skeletons have the same arc radius and the same outer and inner diameters of the cross-sectional circular tubes; the arc radius of the skeleton is R1, the outer diameter of the cross-sectional circular tube is ΦQ, and the inner diameter of the cross-sectional circular tube is Φq; the central angle of the CCT skeleton is Q°, and the angle between the inclined groove and the horizontal plane is E°; the central angle of the DCT skeleton is W°, and the outer surface of the DCT skeleton is provided with an annular racetrack-shaped groove; characterized in that... The manufacturing process includes the following steps: The fabrication process of the skeleton of superconducting arc-shaped inclined solenoid CCT and DCT includes the following steps: 1) Fabrication of G10 skeleton tubes for CCT and DCT Cast G10 pipe blanks according to design requirements; The G10 pipe is formed by heating and expanding the soft mold, positioning the outer side of the metal outer mold, and pressing the pipe by laying glass fiber cloth. 2) CCT and DCT tooling processing and installation ① Three positioning arc plates are machined on the first set of tooling. The upper surface of the positioning arc plates is designed and machined with arc positioning grooves. The arc radius of the arc positioning groove is R1, the diameter of the arc positioning groove cross section is ΦQ, and the central angle is less than 180°. Several vertical screw holes are opened on both sides of the arc positioning groove of the positioning arc plate. These serve as the reference for the first semi-finishing. ② On the second set of tooling, machine the arc positioning grooves on the three positioning arc plates. The arc radius of the arc positioning groove is R1, and the diameter of the cross section of the arc positioning groove is ΦQ. Several vertical screw holes are opened on both sides of the arc positioning groove of the positioning arc plate. An angle positioning block is designed and machined at one end with an angle of Q±0.01° or W±0.01° to ensure that the error is not greater than 0.01°, which serves as the precision machining reference for end positioning. Position each positioning arc plate sequentially onto the tooling base plate, and then fix them together onto the machining table of the machine tool; 3) Semi-finishing of G10 pipe Install the blank G10 tube from step 1) horizontally on the first set of fixtures in step 2), roughly align the blank G10 tube, and symmetrically insert it into the arc positioning groove of the fixture. Use a dial indicator to roughly align the symmetry. The inner arc and the relevant lines at both ends should be within 0.15mm. Fill the gaps in the unsupported parts of the blank G10 tube with plaster to prevent vibration of the part during processing. Then install V-shaped pressure plates to press the blank G10 tube tightly. Install two V-shaped pressure plates on each positioning arc plate. The radius of the arc is R1, the diameter is ΦQ, and the angle is Q±0.01° or W±0.01°. Then machine positioning planes M and N at both ends of the CCT skeleton G10 tube as the alignment reference for clamping the part after it is rotated 180°. The DCT skeleton has a racetrack-shaped groove, and the middle position of the racetrack is designed as a plane. When finishing the arc surface of the DCT skeleton, the center of the annular racetrack groove of the DCT skeleton G10 tube is machined into a plane. This plane serves as the precision reference for aligning the DCT skeleton G10 tube after it has been rotated 180°. 4) Machining of the arc surface of G10 pipe Finish-machine the outer diameter of the upper semicircular surface of the G10 tube. Install the G10 tube on the second set of fixtures. When the machining path of the machine tool head approaches the V-shaped pressure plate, remove the V-shaped pressure plate. After the machining path of the machine tool head passes through, reinstall the V-shaped pressure plate. Sequentially remove and install each V-shaped pressure plate on the machining path until the outer diameter ΦQ of the upper semicircular surface of the G10 tube is completed. The radius of the arc of the arc positioning groove is R1. Then, machine the angle Q±0.01° or W±0.01° of the G10 tube to the drawing size, controlling the angle tolerance to be no greater than ±0.01°. Repeat step 4) once. Remove the V-shaped pressure plate, rotate the G10 tube 180° and install it into the arc positioning groove of the fixture. Finish-machine the outer diameter of the other semicircular surface to ΦQ. Use the angle Q° or W° of the G10 tube to fit with the angle positioning plate. The 0.02mm feeler gauge does not enter. Ensure that the repeatability positioning error is less than 0.

04. Finish-machine the outer diameter of the other semicircular surface of the G10 tube to the size. 5) Precision machining of CCT skeleton G10 tube ① Install the G10 tube with a central angle of Q° that has been rough-machined in step 4) onto the tooling in step 2), and control one end face of the G10 tube to coincide with the side of the adjacent positioning block to ensure that the 0.02mm feeler gauge does not go in; then use a U-shaped pressure plate to press the G10 tube tightly; ensure that the positioning error of the fine-machined G10 tube does not exceed 0.05mm, and use plaster to padded it to prevent the part from vibrating during processing and affecting the surface finish of the part; ② Machining the inclined helical groove with an angle of E° on the upper semicircular surface to the dimensions required in the drawing; when the machining path of the machine tool head approaches the U-shaped pressure plate, remove the U-shaped pressure plate, and reinstall the U-shaped pressure plate after the machining path of the tool head passes through; disassemble and install each U-shaped pressure plate on the machining path in sequence until the machining of the inclined helical groove on the upper semicircular surface of the G10 tube is completed; ③ Remove the U-shaped pressure plate, rotate the G10 tube 180° and insert it into the arc positioning groove of the tooling, then perform the clamping and alignment in step ①, controlling the alignment error to be less than 0.03mm; follow step ② to complete the finishing of the other half of the arc surface and the machining of the inclined spiral groove. 6) Precision machining of DCT skeleton G10 tube For the DCT skeleton finishing process, select the G10 tube with a central angle of W° after rough machining in step 4). The finishing process of the outer diameter of the upper half of the G10 tube in the DCT skeleton is the same as that of the G10 tube in the CCT skeleton. After the outer diameter of the upper half of the G10 tube in the DCT skeleton is finished, process the annular track groove to the dimensions in the drawing according to the drawing requirements. Remove the U-shaped pressure plate, rotate the G10 tube 180° and put it into the arc positioning groove of the tooling, re-clamp and align it, and process the outer diameter of the other half of the G10 tube and the annular track groove.

2. The fabrication process for the skeleton of the superconducting arc-shaped inclined solenoid CCT and DCT according to claim 1, characterized in that, In step 6), after the outer diameter of the upper semicircular surface of the G10 tube is finished, several positioning holes are opened on the center line of the top surface of the G10 tube; when processing the annular track groove, the U-shaped pressure plate is removed, and an arc-shaped horizontal pressure plate is installed on the top surface of the G10 tube through the positioning holes.

3. The fabrication process for the skeleton of the superconducting arc-shaped inclined solenoid CCT and DCT according to claim 1, characterized in that, In step 1, ensure the deflection radius of the G10 bend. Precision, pipe diameter The accuracy meets the design requirements.

4. The skeleton fabrication and manufacturing process of the superconducting arc-shaped inclined solenoid CCT and DCT according to claim 1, characterized in that, The roughing of the G10 pipe (4) uses a CNC three-axis machining center.

5. The skeleton fabrication and manufacturing process of the superconducting arc-shaped inclined solenoid CCT and DCT according to claim 1, characterized in that, The CCT skeleton G10 tube is precision machined using a CNC five-axis machining center.

6. The skeleton fabrication and manufacturing process of the superconducting arc-shaped inclined solenoid CCT and DCT according to claim 1, characterized in that, The finishing of the DCT skeleton G10 tube (6) was performed using a CNC five-axis gantry machining center.

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