Superconducting cavity half-cavity precision stamping automatic demolding mold, mounting method and using method

Abstract

The invention discloses a superconductive cavity half-cavity precision stamping automatic demolding mold, a mounting method and a using method. A lower end protruding part of the punch is clamped and fixed between the U-shaped plate and the upper plate; a stamping male die coaxial with the punch is fixed at the lower end of the upper plate; the female die outer edge piece is fixed to the center of the lower plate, the four ball guide columns are fixed to the upper portions of the four corners of the lower plate respectively, and the upper portion of each ball guide column is in sliding connection with the upper plate through a set of ball copper sleeves and ball guide sleeves. The stamping male die directly faces the outer portion of the female die of the female die outer edge piece, the middle of the female die of the female die retreating piece and the central opening of the female die bottom plate. The outer portion of the female die, the middle of the female die and the central opening jointly form the outline of the female die, and the female die outer edge piece, the female die retreating piece and the female die bottom plate are in contact with the stamping male die and the stamping pressing plate together with the niobium plate in the half-cavity stamping process. According to the semi-cavity batch stamping device, automatic material pressing and automatic demolding are achieved, the technical problem that automatic demolding cannot be achieved after stamping is solved, and the semi-cavity batch stamping efficiency and stamping precision are improved.

Description

Technical Field

[0001] The invention belongs to the technical field of stamping metals, and in particular relates to an automatic demoulding die for precision stamping of a superconducting cavity and a half cavity. Background Art

[0002] Particle accelerators are vacuum experimental devices that use electromagnetic fields to accelerate charged particles. Their application areas include advanced light sources, particle colliders, industrial accelerators, and medical accelerators. Particle accelerators not only provide important research methods in the fields of materials science, nuclear science, medicine, and chemistry, but also play a unique role in various national economic fields such as isotope production, radiation medicine, and industrial irradiation. Radio frequency superconducting technology is an advanced technology of modern particle accelerators. It couples external radio frequency power through antennas or waveguides to excite electromagnetic fields in metal superconductor cavities. Charged particles enter the electromagnetic field at a suitable phase and interact with it, which increases the energy of the particles. Compared with room temperature accelerators, radio frequency superconducting accelerators use superconductors as acceleration cavity materials, which can reduce the radio frequency loss and operating costs of the acceleration cavity and improve energy utilization. Superconducting cavity materials generally use pure niobium. Niobium superconducting cavities need to be immersed in liquid helium and equipped with cryogenic pumps, liquid helium dewars and other cryogenic system equipment for stable operation.

[0003] Radio frequency superconducting accelerators have received extensive attention and development in the past 50 years, and have been used in various types of accelerators, such as large particle colliders, synchrotron radiation sources, and free electron laser devices at home and abroad. As the core component of linear accelerators, the 1.3GHz 9cell superconducting cavity is the most used and widely used superconducting cavity in accelerators around the world. It is also the main cavity type for high repetition rate free electron laser devices at home and abroad and future high-energy physics colliders (such as the Circular Electron Positron Collider CEPC and the International Linear Collider ILC). With the construction of multiple large particle accelerator scientific facilities in my country, 1,000 1.3GHz 9cell superconducting cavities will be needed in the next five years.

[0004] The 1.3GHz 9cell superconducting cavity mainly includes 9 accelerating cells and two beam tube assemblies. Each accelerating cell consists of two half cavities, and each superconducting cavity has a total of 18 half cavities. The superconducting cavity also includes a pure titanium helium tank welded to the end cavity assembly. The superconducting cavity is made of high-purity niobium material through stamping, stretching, machining and electron beam welding. Conventional half-cavity stamping requires 8 steps: loading → pressing the pressure plate → stamping → turning the hole → loosening the pressure plate → flipping → demolding → cleaning the mold. This is mainly because the stress at the equator and IRIS of the half-cavity is large and the equatorial wall is thick. Therefore, when demolding, the half-cavity blank will stay in the mold of the concave mold, which requires manual flipping and demolding operations; further resulting in low efficiency and high labor intensity of conventional half-cavity stamping. It requires 4 people to complete the stamping operation. One press can stamp 12-15 half cavities per day (8 hours of work). With the increase in demand for 9cell cavities, half-cavity stamping has become one of the bottlenecks of mass manufacturing. Summary of the invention

[0005] In view of the problems existing in the background technology, the present invention provides a superconducting cavity half-cavity precision stamping automatic demoulding die, which solves the technology of low efficiency and low precision of half-cavity stamping. The technical scheme includes: a punch connecting plate, a punch, a U-shaped plate, a ball guide column, an upper plate, a lower plate, a stamping punch, a stamping die assembly, a stamping platen, a ball copper sleeve, a ball guide sleeve, a die outer edge part, a die stripping part, a die bottom plate and a die spring, wherein the punch is fixed to the punch connecting plate, the lower end protrusion of the punch is arranged in the U-shaped groove of the U-shaped plate, the lower edge of the U-shaped plate and the upper plate are fixed by bolts, and the lower end protrusion of the punch is clamped and fixed between the U-shaped plate and the upper plate; the stamping punch coaxial with the punch is fixed to the lower end of the upper plate;

[0006] The outer edge of the die is fixed at the center of the lower plate, and four ball guide pillars are respectively fixed above the four corners of the lower plate. The upper part of each ball guide pillar is slidably connected to the upper plate through a set of ball copper sleeves and ball guide sleeves.

[0007] The punch is directly opposite to the outside of the die of the outer edge of the die, the middle of the die of the die stripping piece and the central opening of the die bottom plate; the outside of the die, the middle of the die and the central opening together constitute the contour of the die, and the outer edge of the die, the die stripping piece and the die bottom plate are in contact with the niobium plate together with the punch and the stamping platen during the half-cavity stamping process;

[0008] The die outer edge part and the die bottom plate are fixed by die mounting bolts evenly distributed around the circumference; a space is formed between the die outer edge part and the die bottom plate to accommodate the up and down movement of the die ejection part; a die spring for providing upward reset is arranged between the die ejection part and the die; a die outer portion is arranged at the upper end of the die outer edge part, a die middle portion is arranged at the center of the upper end of the die ejection part, a central opening is arranged at the center of the die bottom plate, and the lower end surface of the die ejection part is in contact and connected with the die bottom plate.

[0009] The outer side of the middle part of the die is located on the large arc section of the cross section of the die contour.

[0010] A die limiting baffle is integrally fixed to the middle of the edge of the die ejection part, and the die limiting baffle provides upward constraint for the die ejection part. The side wall of the die limiting baffle and the side wall of the middle part of the die together provide constraint on the sliding direction of the die ejection part. The up and down movement stroke of the die ejection part is greater than 8mm, and the axial length of the half cavity is less than 60mm.

[0011] The inner side of the middle part of the die is located at the tangent point of the outer side of the elliptical arc segment.

[0012] The total fixing force provided by the die mounting bolts is 1.3 times the total maximum stroke pressure of the die spring, and the depth of the countersunk hole of the die outer edge part is not less than 1.5 times the standard countersunk.

[0013] The automatic demoulding mold also includes: an upper working platform of the press, a lower working platform of the press, a lower platform pressure plate, a middle plate, a guide column limiter, a mold compression spring and a mold compression spring, wherein the upper working platform of the press is fixed to the punch connecting plate, and the lower plate is fixed to the lower working platform of the press through the lower platform pressure plate, and the middle part of each ball guide column is slidingly connected to the middle plate through a group of ball copper sleeves and ball guide sleeves respectively, and the upper end of the ball guide column is fixed with a guide column limiter; the mold compression spring is installed between the upper plate and the middle plate to provide an upward reset elastic force, the stamping pressure plate is fixed to the lower end of the middle plate, and the mold compression spring is installed between the middle plate and the lower plate to provide an upward reset elastic force.

[0014] The middle plate is square outside and round inside, and the diameter of the middle circle is 1mm larger than the outer diameter of the punch.

[0015] The present invention also provides a method for installing a superconducting cavity half-cavity precision stamping automatic demoulding die, and the technical solution includes:

[0016] Step 1: The outer edge of the die, the die ejector, the die bottom plate and the die spring are assembled and bolted to form a stamping die assembly;

[0017] Step 2, the punching die assembly is fixed to the lower plate with assembly bolts;

[0018] Step 3, assemble and fix the lower plate and the ball guide column;

[0019] Step 4: Assemble and fix the middle plate and the stamping plate, and then install the ball guide bushing;

[0020] Step 5: Place the mold compression spring into the groove of the lower plate, and then assemble the middle plate and the ball guide column. The middle plate and the lower plate are connected and supported by a support plate;

[0021] Step 6: Assemble and fix the upper plate and the ball guide sleeve, and then install and fix them with the U-shaped plate;

[0022] Step 7: Place the mold compression spring into the groove of the middle plate, and then assemble the upper plate onto the ball guide column;

[0023] Step 8: After the punch and the punch connecting plate are installed and fixed, they are bolted to the working platform on the press;

[0024] Step 9: The working platform on the press slowly descends until it is suitable, and the U-shaped plate is pushed into the punch step;

[0025] Step 10: The lower plate, the lower platform pressure plate, and the lower working platform of the press are fixed with bolts.

[0026] The present invention also provides a method for using a superconducting cavity half-cavity precision stamping automatic demoulding die, and the technical solution includes:

[0027] Step 21, brush lubricating oil on both sides of the niobium plate and put it into the groove of the die;

[0028] Step 22, the working platform on the press moves downward, and the pressure is transmitted through the punch and the upper plate, and the punching plate presses the niobium plate tightly;

[0029] Step 23, the punching punch continues to move downward, and the niobium plate is gradually formed; when the lower end of the niobium plate is pressed to the area of ​​the die stripping part, the die stripping part gradually moves downward; and finally the die stripping part is pressed to the bottom, and the die formed by the niobium plate, the outside of the die, the middle of the die and the central opening is pressed tightly, and the pressure is adjusted to 120T;

[0030] Step 24: After the niobium plate is formed, the pressure is maintained;

[0031] Step 25, after the pressure holding is completed, the upper workbench of the press starts to move upward, and the die ejection parts of the concave mold are ejected synchronously, completing the half-cavity demolding;

[0032] Step 26: The upper workbench of the press moves upward to the set upper limit position and stops;

[0033] Step 27. Manually take out the half cavity and check the surface.

[0034] After step 27, assembly is performed, including:

[0035] Step A: Finishing of the half cavity: Put the stamped half cavity into the processing tooling and fix it. According to the size of the half cavity drawing, remove the excess parts of the equator and iris end surface by turning to make the half cavity finished product;

[0036] Step B: Measurement / testing of semi-cavity finished products: Use a three-dimensional coordinate measuring machine or laser scanner to measure the diameter, height, coaxiality, parallelism, surface profile dimensions and geometric tolerances of the semi-cavity finished products.

[0037] Step C: The equatorial ends of the two half-cavity products are fixed to form an accelerating cavity cell.

[0038] The beneficial effects of the present invention are:

[0039] 1. The present invention designs and manufactures a set of automatic demoulding dies to realize automatic material pressing and automatic demoulding. The stamping can be completed in three steps of loading → stamping → unloading, realizing the functions of automatic material pressing and automatic demoulding. 60-80 half-cavity stampings can be completed every day (8 hours of work), solving the technical problems of automatic demoulding after half-cavity stamping and half-cavity precision stamping, and improving the efficiency and stamping accuracy of half-cavity batch stamping.

[0040] 2. The automatic ejection adopts a mold spring structure, and the punch demolding and half-cavity ejection are completed synchronously, reducing the influence of mold ejection on the half-cavity contour. At the same time, a suitable shape of the die ejection part is set, so that the half-cavity contour deviation after demolding meets the design requirements.

[0041] 3. No need for manual demoulding, thus reducing the number of operators for each press to at least one person, low labor intensity and greatly reduced production costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] Figure 1 It is a schematic elevation view of an embodiment of a superconducting cavity half-cavity precision stamping automatic demoulding mold of the present invention.

[0043] Figure 2 It is a schematic elevation view of the structure of the stamping die assembly in an embodiment of the present invention.

[0044] Figure 3 It is a schematic structural diagram of an embodiment of the present invention.

[0045] Figure 4 This is a schematic diagram of the measurement results of the inner contour of the half cavity after stamping using three-coordinate measurement according to an embodiment of the present invention.

[0046] Figure 5 It is a schematic diagram of the structure of the rear half cavity after fine machining in an embodiment of the present invention.

[0047] Figure 6 It is a schematic diagram of the structure after being assembled into a complete superconducting cavity in an embodiment of the present invention.

[0048] Among them, 1-press upper working platform, 2-punch connecting plate, 3-punch, 4-press lower working platform, 5-lower platform pressure plate, 6-U-shaped plate, 7-ball guide column, 8-upper plate, 9-middle plate, 10-lower plate, 11-stamping punch, 12-stamping die assembly, 13-stamping pressure plate, 14-ball copper sleeve, 15-ball guide sleeve, 16-guide column limit, 17-support plate, 18-die compression spring, 19-die compression spring, 20-die outer edge part, 21-die ejection part, 22-die bottom plate, 23-die spring, 201-die outside, 202-countersunk hole, 211-die middle, 212-die limit baffle, 221-central opening. DETAILED DESCRIPTION

[0049] The present invention is further described in detail below in conjunction with the accompanying drawings.

[0050] like Figure 1 to Figure 3 The embodiment of the present invention shown in the figure comprises: an upper working platform 1 of a press, a punch connecting plate 2, a punch 3, a lower working platform 4 of a press, a lower platform pressing plate 5, a U-shaped plate 6, a TRP ball guide column 7, an upper plate 8, a middle plate 9, a lower plate 10, a stamping punch 11, a stamping die assembly 12, a stamping pressing plate 13, a TRP ball copper sleeve 14, a TRP ball guide sleeve 15, a guide column limiter 16, a support plate 17, Die compression spring 18, The die compression spring 19, the die outer edge part 20, the die ejection part 21, the die bottom plate 22 and Die spring 23, wherein

[0051] The lower plate 10 is fixed on the lower working platform 4 of the press through the lower platform pressing plate 5. Four TRP ball guide pillars 7 are respectively fixed above the four corners of the lower plate 10. The middle and upper parts of each TRP ball guide pillar 7 are respectively slidably connected with the upper plate 8 and the middle plate 9 through a set of TRP ball copper sleeves 14 and TRP ball guide sleeves 15, thereby forming a four-column guide sliding structure of the stamping die; a guide pillar limiter 16 is fixed to the upper end of the ball guide pillar 7; The mold compression spring 18 is installed between the upper plate 8 and the middle plate 9 to provide an elastic force for returning upward. The mold compression spring 19 is installed between the middle plate 9 and the lower plate 10 to provide an elastic force for returning upward;

[0052] The punch 3 is fixed to the working platform 1 on the press through the punch connecting plate 2. The lower end protrusion of the punch 3 is arranged in the U-shaped groove of the U-shaped plate 6. The lower edge of the U-shaped plate 6 and the upper plate 8 are fixed by bolts. The lower end protrusion of the punch 3 is clamped and fixed between the U-shaped plate 6 and the upper plate 8. The punching punch 11 coaxial with the punch 3 is fixed to the lower end of the upper plate 8.

[0053] The die outer edge part 20 is fixed at the center of the lower plate 10, the die outer edge part 20 and the stamping plate 13 are fixed at the lower end of the middle plate 9, the stamping punch 11 is directly opposite to the opening of the middle plate 9, the opening of the stamping plate 13, the die outer part 201 of the die outer edge part 20, the die middle part 211 of the die ejector 21 and the central opening 221 of the die bottom plate 22; the die outer edge part 20, the die ejector 21 and the die bottom plate 22 as the stamping die assembly 12 are in contact with the niobium plate together with the stamping punch 11 and the stamping plate 13 during the stamping process.

[0054] The die outer edge part 20 and the die bottom plate 22 are fixed by die mounting bolts evenly distributed around the circumference. A space is formed between the die outer edge part 20 and the die bottom plate 22 to accommodate the die ejection part 21 to move up and down. A space is provided between the die ejection part 21 and the die ejection part 21 to provide upward reset. The die spring 23; the upper end of the die outer edge part 20 is provided with a die outer part 201, the upper end center of the die ejection part 21 is provided with a die middle part 211, and the center of the die bottom plate 22 is provided with a central opening 221. The die outer part 201, the die middle part 211 and the central opening 221 together constitute the contour of the die, that is, the spatial shape of the half-cavity molding; the lower end surface of the die ejection part 21 is in contact with the die bottom plate 22, so that the die ejection part 21 is provided with a lower end when it moves to the lower end during the stamping process. Provide support; a die limit baffle 212 is integrally fixed to the middle part of the edge of the die ejection piece 21, and the die limit baffle 212 provides upward constraint for the die ejection piece 21, preventing the die ejection piece 21 from falling out during the ejection process, while allowing the half cavity to stay in a position where it can be easily taken out; the side walls of the die limit baffle 212 and the side walls of the die middle part 211 together provide constraints on the sliding direction of the die ejection piece 21, ensuring the die pressing accuracy and uniform force on the half cavity during ejection.

[0055] The cross section of the die profile is composed of a continuous multi-segment curve, wherein the equatorial end (outermost side) is a large arc segment 60, and the iris end (most center) is an elliptical arc segment 70. In this embodiment, the outer side of the die middle portion 211 is on the large arc segment (radius 42 mm) to provide sufficient strength, so that the automatic mold removal process will only produce a slight deformation of the half cavity that does not affect the physical parameters of the half cavity finished product. If it is changed to other positions, the relatively soft nature of high-purity niobium will cause surface deformation during the automatic mold removal process, affecting the physical parameters of the cavity, making it difficult to apply in practice; the inner side of the die middle portion 211 is located at the tangent point of the outer side of the elliptical arc segment (and the tangent points of the other continuous multi-segment curves on the outer side), which can minimize the indentation of the mold separation position (the separation position of the die middle portion 211 and the die bottom plate 22) on the outer side of the half cavity during automatic mold removal;

[0056] The total fixing force provided by the die mounting bolts is more than 1.3 times the total maximum stroke pressure of the mold spring 23 to avoid fatigue failure of the bolts; in the present embodiment, the die outer edge part 20 and the die bottom plate 22 are fixed with 24 M14 die assembly fixing bolts evenly distributed around the circumference, and the depth of the countersunk holes 202 on the die outer edge part 20 for installing the die assembly fixing bolts is not less than 1.5 times of the standard countersunk; in actual application, even if the die end face is repaired multiple times, it can still be effectively fixed.

[0057] In this embodiment, the up and down movement stroke of the female mold ejector 21 needs to be greater than 8 mm, otherwise the half cavity cannot be freely taken out.

[0058] The size of the upper working platform 1 of the press is 800×800, and it is provided with a plurality of upper platform T-slots for installing the punch connecting plate 2 to transmit the pressure of the four-column press; the punch connecting plate 2 is fixed to the T-slot of 1 with bolts; the upper end of the punch 3 is connected to the punch connecting plate 2 by bolts. The size of the lower working platform 4 of the press is 800×800, and it is provided with a plurality of lower platform T-slots for installing the lower plate 10, which mainly serves as a mold support.

[0059] TRP ball guide column 7, TRP ball copper sleeve 14 and TRP ball guide sleeve 15 are all made of SUJ2, Specifications of standard accessories.

[0060] The upper plate 8 is square. When installing, first fix the stamping punch 11 with the countersunk bolts of the upper plate; then fix the U-shaped plate 6 on the upper plate 8, with the U-shaped opening direction facing forward; after the TRP ball guide sleeve 15 is assembled with the upper plate, the side is limited by a top screw to prevent the TRP ball guide sleeve 15 from axial slippage.

[0061] The middle plate 9 is square outside and round inside, and the diameter of the middle circle (the opening through which the punch 11 passes) is 1mm larger than the outer diameter of the punch 11; when installing the middle plate 9, first stamp the pressure plate 13 and fix it on the middle plate 9. The pressure plate 13 is a circular ring with an outer diameter larger than the outer diameter of the niobium plate, and an inner diameter (the opening through which the punch 11 passes) is 1mm larger than the outer diameter of the punch 11; then, after assembling the TRP ball guide sleeve 15 with the middle plate, use a top screw to limit the side to prevent 15 from axial slippage.

[0062] When installing the lower plate 10, first fix the stamping die assembly 12 and the lower plate 10 with countersunk bolts; then assemble the lower end of the TRP ball guide column 7 with the lower plate 10, and fix the side with a top screw; finally, connect and tighten 10 and 4 with 5 bolts.

[0063] When processing the stamping die assembly 12: first, the die outer edge part 20, the die backing part 21 and the die bottom plate 22 are processed according to the drawing size, and a 2-3mm margin is reserved for the inner curved surface; then the rough-processed die assembly is quenched to strengthen the curved surface hardness and reduce the wear of the stamping die on the die; when assembling the stamping die assembly 12: first, it is assembled according to the designed curved surface shape of the die and fastened with bolts, and then the curved surface of the die assembly is finely processed as a whole; then the die assembly is disassembled, and the The mold spring 23 is placed in the groove 22; then the die outer edge part 20, the die ejection part 21 and the die bottom plate 22 are assembled and bolted; the die ejection part 21 is passed through The spring force of the mold spring 23 realizes half-cavity ejection.

[0064] When the mold is out of use, the upper plate 8 and the middle plate 9 are connected by bolts through the support plate 17: thereby the upper plate 8 and the middle plate 9 are connected and fixed, playing a supporting role, preventing the concave die and the convex die from colliding, and ensuring safe transportation.

[0065] The stamping die assembly includes: a stamping punch 11, a stamping plate 13, a die outer edge part 20, a die stripper 21 and a die bottom plate 22. In this embodiment, 7075 aviation aluminum alloy is selected as the stamping die assembly material. When manufacturing the stamping die assembly, after rough machining, it needs to be quenched at 420°C for 3 hours and then fine-machined.

[0066] In this embodiment, The number of die compression springs 18 is 4, and the size specifications are The maximum compression stroke is 90 mm, and the maximum pressing force is 200 kg (determined by experience). The main function is to transmit the pressing force to the pressing plate 13 to prevent wrinkling during the half-cavity stamping process. The number of die compression springs 19 is 2, and the size specifications are The maximum compression stroke is 100mm, and the 10mm compression force is greater than the weight of the mold. The main function is to support the middle plate; Die spring 23, total 16 pieces, size specifications The maximum clamping force is 200kg (determined by experience), and its main function is to eject the 21 die ejection parts and realize automatic ejection.

[0067] The installation process of this embodiment is as follows: ① the outer edge part 20 of the die, the die stripping part 21, the die bottom plate 22 and The die spring 23 is now assembled and bolted to form a stamping die assembly 12; ② The stamping die assembly 12 is assembled and bolted to the lower plate 10; ③ The lower plate 10 is assembled and fixed to the TRP ball guide column 7; ④ The middle plate 9 is assembled and fixed to the stamping plate 13, and then the TRP ball guide sleeve 15 is installed; ⑤ Put the mold compression spring 19 into the groove of the lower plate 10, then assemble the middle plate 9 with the TRP ball guide column 7, and connect and support the middle plate 9 and the lower plate 10 with the support plate 17; ⑥ Assemble and fix the upper plate 8 and the TRP ball guide sleeve 15, and then install and fix it with the U-shaped plate 6; ⑦ The die compression spring 18 is placed in the groove of the middle plate 9, and then the upper plate 8 is assembled on the TRP ball guide column 7;⑧ After the punch 3 and the punch connecting plate 2 are installed and fixed, they are bolted to the upper working platform 1 of the press;⑨ The upper working platform 1 of the press is slowly lowered until it is suitable, and the U-shaped plate 6 is pushed into the step of the punch 3;⑩ The lower plate 10, the lower platform pressure plate 5, and the lower working platform 4 of the press are bolted and fixed; Adjust the upper limit switch on the press to prevent the mold from completely disengaging from the guide pillars.

[0068] The half-cavity stamping process of this embodiment is as follows:

[0069] Step 21, brush lubricating oil on both sides of the niobium plate and put it into the groove of the die;

[0070] Step 22, the working platform on the press moves downward, and the pressure is transmitted through the punch 3 and the upper plate 8, and the punching plate 13 presses the niobium plate;

[0071] Step 23, the punching punch 11 continues to move downward, and the niobium plate is gradually formed; when the lower end of the niobium plate is pressed to the area of ​​the die stripping piece 21, the die stripping piece 21 gradually moves downward; and finally the die stripping piece 21 is pressed to the lowest end, and the die formed by the niobium plate, the die outer part 201, the die middle part 211 and the central opening 221 is pressed tightly, and the pressure is adjusted to 120T;

[0072] Step 24: After the niobium plate is formed, start timing and maintain pressure for 3 minutes;

[0073] Step 25, after the pressure holding is completed, the upper workbench of the press starts to move upward, and the female mold ejection part 21 is ejected synchronously, completing the half-cavity ejection;

[0074] Step 26: The upper workbench of the press moves upward to the set upper limit position and stops;

[0075] Step 27, manually take out the half cavity and check whether there are defects, indentations, etc. on the surface of the half cavity; the half cavity stamping process is completed; return to step 1 to continue stamping the next half cavity, and each half cavity stamping takes about 5 minutes.

[0076] After step 27, the half cavity is measured, and the inner contour deviation of the half cavity is measured by three-coordinate measurement, which is ≤±0.2mm, meeting the half cavity design requirements.

[0077] In actual work, both sides of the niobium plate are lubricated before stamping, so that the half-cavity blank after actual stamping in step 26 usually stays in the middle 211 of the die; although it occasionally does not rise together with the stamping punch 11 and contact the stamping plate 13 and automatically fall off (the probability of staying in the punch in actual operation does not exceed 5 / 1000), but in either case, it can be easily taken out by hand, which not only ensures the accuracy of the half-cavity contour, but also saves operation time.

[0078] After all half-cavity stamping processes are completed, assembly is carried out, including:

[0079] Step A: Semi-cavity finishing: (such as Figure 5 (As shown in the figure), the stamped half cavity is placed in the processing tooling and fixed. According to the size of the half cavity drawing, the excess parts of the equator and iris end faces are turned away to make the half cavity finished product; 1.9mm margin is reserved for the equator end face, 0.5mm margin is reserved for the iris end face, and the axial length of the half cavity is between 56mm and 60mm (specifically divided into three sizes of 56mm, 57mm and 57.7mm).

[0080] Step B: Half-cavity measurement / testing: Use a three-dimensional coordinate measuring machine or laser scanner to measure the diameter, height, coaxiality, parallelism, surface profile and other dimensions and form tolerances of the half-cavity finished product according to the half-cavity drawing and 3D model.

[0081] Step C: The equatorial ends of the two half-cavities are fixed to form an accelerating cavity cell, such as Figure 6 shown.

Claims

1. A superconducting cavity half cavity precision stamping automatic demoulding die, characterized in that: include: A punch connecting plate (2), a punch (3), a U-shaped plate (6), a ball guide column (7), an upper plate (8), a lower plate (10), a stamping punch (11), a stamping die assembly (12), a stamping plate (13), a ball copper sleeve (14), a ball guide sleeve (15), a die outer edge member (20), a die ejection member (21), a die bottom plate (22) and a die spring (23), wherein the punch (3) is fixed to the punch connecting plate (2), a lower end protrusion of the punch (3) is arranged in a U-shaped groove of the U-shaped plate (6), a lower edge of the U-shaped plate (6) and the upper plate (8) are fixedly connected by bolts, and a lower end protrusion of the punch (3) is clamped and fixed between the U-shaped plate (6) and the upper plate (8); a stamping punch (11) coaxial with the punch (3) is fixed to the lower end of the upper plate (8); The outer edge part (20) of the concave mold is fixed at the center of the lower plate (10), and four ball guide pillars (7) are respectively fixed above the four corners of the lower plate (10), and the upper part of each ball guide pillar (7) is slidably connected to the upper plate (8) through a group of ball copper sleeves (14) and ball guide sleeves (15); The punching punch (11) faces the die outer portion (201) of the die outer edge member (20), the die middle portion (211) of the die stripping member (21) and the central opening (221) of the die bottom plate (22); the die outer portion (201), the die middle portion (211) and the central opening (221) together constitute the contour of the die; the die outer edge member (20), the die stripping member (21) and the die bottom plate (22) contact the niobium plate together with the punching punch (11) and the punching plate (13) during the half-cavity punching process; The die outer edge part (20) and the die bottom plate (22) are fixed by die mounting bolts evenly distributed around the circumference; a space is enclosed between the die outer edge part (20) and the die bottom plate (22) to accommodate the die ejection part (21) to move up and down; a die spring (23) is provided between the die ejection part (21) and the die for providing upward reset; a die outer part (201) is provided at the upper end of the die outer edge part (20); a die middle part (211) is provided at the center of the upper end of the die ejection part (21); a central opening (221) is provided at the center of the die bottom plate (22); and a lower end surface of the die ejection part (21) is in contact with and connected to the die bottom plate (22).

2. A superconducting cavity half cavity precision stamping automatic demoulding mold according to claim 1, characterized in that: The outer side of the middle part (211) of the die is located on the large arc section (60) of the cross section of the die profile.

3. A superconducting cavity half cavity precision stamping automatic demoulding mold according to claim 1 or 2, characterized in that: A die limiting baffle (212) is integrally fixed to the middle of the edge of the die ejection member (21), the die limiting baffle 212 provides upward constraint for the die ejection member (21), and the side wall of the die limiting baffle (212) and the side wall of the die middle part (211) together provide constraint on the sliding direction of the die ejection member (21); the stroke of the die ejection member (21) moving up and down is greater than 8 mm, and the axial length of the half cavity is less than 60 mm.

4. The superconducting cavity half cavity precision stamping automatic demoulding mold according to claim 3 is characterized in that: The inner side of the middle part (211) of the die is located at the tangent point of the outer side of the elliptical arc segment (70).

5. The superconducting cavity half cavity precision stamping automatic demoulding mold according to claim 3, characterized in that: The total fixing force provided by the die mounting bolts is 1.3 times the total maximum stroke pressure of the die spring (23), and the depth of the countersunk hole (202) of the die outer edge part (20) is not less than 1.5 times the standard countersunk hole.

6. The superconducting cavity half cavity precision stamping automatic demoulding mold according to claim 3, characterized in that: The automatic demoulding mold also includes: an upper working platform (1) of a press, a lower working platform (4) of a press, a lower platform pressure plate (5), a middle plate (9), a guide column limiter (16), a mold compression spring (18) and a mold compression spring (19), wherein the upper working platform (1) of the press is fixed to the punch connecting plate (2), the lower plate (10) is fixed to the lower working platform (4) of the press through the lower platform pressure plate (5), the middle part of each ball guide column (7) is slidably connected to the middle plate (9) through a group of ball copper sleeves (14) and ball guide sleeves (15), and the upper end of the ball guide column (7) is fixed with a guide column limiter (16); the mold compression spring (18) is installed between the upper plate (8) and the middle plate (9) to provide an upward reset elastic force, the punch pressure plate (13) is fixed to the lower end of the middle plate (9), and the mold compression spring (19) is installed between the middle plate (9) and the lower plate (10) to provide an upward reset elastic force.

7. The superconducting cavity half cavity precision stamping automatic demoulding mold according to claim 6, characterized in that: The middle plate (9) is square outside and round inside, and the diameter of the middle circle is 1 mm larger than the outer diameter of the punch (11).

8. A method for installing the superconducting cavity half cavity precision stamping automatic demoulding mold as claimed in claim 1, characterized in that: include: Step 1: The outer edge of the die, the die ejector, the die bottom plate and the die spring are assembled and bolted to form a stamping die assembly; Step 2, the punching die assembly is fixed to the lower plate with assembly bolts; Step 3, assemble and fix the lower plate and the ball guide column; Step 4: Assemble and fix the middle plate and the stamping plate, and then install the ball guide bushing; Step 5: Place the mold compression spring into the groove of the lower plate, and then assemble the middle plate and the ball guide column. The middle plate and the lower plate are connected and supported by a support plate; Step 6: Assemble and fix the upper plate and the ball guide sleeve, and then install and fix them with the U-shaped plate; Step 7: Place the mold compression spring into the groove of the middle plate, and then assemble the upper plate onto the ball guide column; Step 8: After the punch and the punch connecting plate are installed and fixed, they are bolted to the working platform on the press; Step 9: The working platform on the press slowly descends until it is suitable, and the U-shaped plate is pushed into the punch step; Step 10: The lower plate, the lower platform pressure plate, and the lower working platform of the press are fixed with bolts.

9. A method for using the superconducting cavity half cavity precision stamping automatic demoulding mold as claimed in claim 1, characterized in that: include: Step 21, brush lubricating oil on both sides of the niobium plate and put it into the groove of the die; Step 22, the working platform on the press moves downward, and the pressure is transmitted through the punch and the upper plate, and the punching plate presses the niobium plate tightly; Step 23, the punching punch continues to move downward, and the niobium plate is gradually formed; when the lower end of the niobium plate is pressed to the area of ​​the die stripping part, the die stripping part gradually moves downward; and finally the die stripping part is pressed to the bottom, and the die formed by the niobium plate, the outside of the die, the middle of the die and the central opening is pressed tightly, and the pressure is adjusted to 120T; Step 24: After the niobium plate is formed, the pressure is maintained; Step 25, after the pressure holding is completed, the upper workbench of the press starts to move upward, and the die ejection parts of the concave mold are ejected synchronously, completing the half-cavity demolding; Step 26: The upper workbench of the press moves upward to the set upper limit position and stops; Step 27. Manually take out the half cavity and check the surface.

10. The superconducting cavity half cavity precision stamping automatic demoulding mold according to claim 9, characterized in that: After step 8, proceed to assembly, including: Step A: Finishing of the half cavity: Put the stamped half cavity into the processing tooling and fix it. According to the size of the half cavity drawing, remove the excess parts of the equator and iris end surface by turning to make the half cavity finished product; Step B: Measurement / testing of semi-cavity finished products: Use a three-dimensional coordinate measuring machine or laser scanner to measure the diameter, height, coaxiality, parallelism, surface profile dimensions and geometric tolerances of the semi-cavity finished products. Step C: The equatorial ends of the two half-cavity products are fixed to form an accelerating cavity cell.

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