A method for manufacturing a high-energy collimator

Abstract

This application discloses a method for manufacturing a high-energy collimator, comprising: preparing a first bar stock with an outwardly convex flange structure at the end face edge; drilling several wire-cut holes through to the other end on the end face of the first bar stock to form a second bar stock; heat-treating the second bar stock to form a third bar stock; wire-cutting the third bar stock according to a first design requirement to obtain a first prototype; heat-treating the first prototype to obtain a second prototype; milling both ends of the second prototype according to a second design requirement to obtain a third prototype; semi-finishing the outer circle of the third prototype to obtain a fourth prototype; heat-treating the fourth prototype to obtain a fifth prototype; wire-cutting the inner cavity of the fifth prototype according to a third design requirement to obtain a sixth prototype; finishing the sixth prototype, opening flange holes at the end face, and deburring to obtain a collimator frame; wire-cutting a tantalum plate according to the design drawings; inserting the cut tantalum plate into the collimator frame to complete the collimator manufacturing.

Description

Technical Field

[0001] This application relates to the field of collimator technology, and in particular to a method for manufacturing a high-energy collimator. Background Technology

[0002] Traditional collimator manufacturing processes are complex and involve a lot of manual intervention, resulting in reduced dimensional accuracy and slow production efficiency. Summary of the Invention

[0003] This specification presents an embodiment of a high-energy collimator manufacturing method, which solves the problems of reduced dimensional accuracy and slow production efficiency caused by the complexity of traditional collimator manufacturing processes and the large number of manual processes involved.

[0004] Therefore, the embodiments of this specification provide the following solution: a method for manufacturing a high-energy collimator, comprising:

[0005] Prepare the first bar stock, with its two end faces perpendicular to the generatrix by no more than 0.1mm, and one end face having an outwardly protruding edge forming a flange structure;

[0006] A plurality of wire cutting holes are drilled on the end face of the first bar, extending to the other end. Each wire cutting hole is parallel to the axis of the first bar. The plurality of wire cutting holes are on the same horizontal plane as the axis of the first bar and are spaced apart to form a second bar.

[0007] The second bar stock is heat-treated to form the third bar stock;

[0008] The third bar is wire-cut according to the first design requirements to obtain a first prototype.

[0009] The first prototype is subjected to heat treatment to obtain the second prototype;

[0010] According to the second design requirements, the two end faces of the second prototype are milled to obtain the third prototype;

[0011] The outer circle of the third prototype is semi-finished to obtain the fourth prototype;

[0012] The fourth prototype was subjected to heat treatment to obtain the fifth prototype;

[0013] According to the third design requirements, the inner cavity of the fifth prototype is wire-cut to process the fifth prototype to the final size requirements, thus obtaining the sixth prototype.

[0014] The sixth prototype is precision machined, the end flange is opened and deburred to obtain the collimator frame;

[0015] tantalum plates are wire-cut according to the design drawings;

[0016] Insert the cut tantalum plate into the collimator frame to complete the collimator fabrication.

[0017] Furthermore, the diameter of the wire-cut hole is Φ8mm~Φ10mm.

[0018] Furthermore, the heat treatment method includes:

[0019] Keep warm at 110℃~130℃ for 3~5 hours;

[0020] Cool naturally inside the furnace;

[0021] The scheduled time has been announced.

[0022] Furthermore, the first design requirement includes:

[0023] The thickness allowance on each side should be at least 1mm.

[0024] The main grid plate thickness is machined to at least 4mm;

[0025] The concentricity of the inner and outer circles shall not exceed ±0.1mm;

[0026] The perpendicularity of all wire-cut surfaces to the flange end face shall not exceed ±0.1mm.

[0027] Furthermore, the second design requirement includes:

[0028] The second prototype is processed to a preset height;

[0029] Concave platforms are milled out on both ends of the second prototype;

[0030] Mill the flange to the preset size.

[0031] Furthermore, before performing semi-finish turning on the outer diameter of the third prototype, the third prototype is fixed to the first tooling.

[0032] Furthermore, the first tooling includes: two discs pressing against the two end faces of the collimator, and four pull rods passing through the collimator, wherein the four pull rods can be fixedly connected to the two discs.

[0033] Furthermore, the third design requirement includes:

[0034] The inner barrel wall, main grid plate and slot are precision machined to the final size according to the drawing requirements. The inner surface of the cavity and the slot are cut sequentially in one go, avoiding the need to change wires in the same cavity.

[0035] Furthermore, before wire cutting the inner cavity of the fifth prototype, the fifth prototype is fixed onto the second tooling.

[0036] Furthermore, the second tooling component includes:

[0037] Two plates are fixedly connected by a connecting rod, with the two plates spaced apart. Each plate has a through hole, the inner diameter of which is larger than the outer diameter of the fifth prototype but smaller than the outer diameter of the flange of the fifth prototype.

[0038] The above-described technical solutions adopted in the embodiments of this application can achieve the following beneficial effects:

[0039] The "one-cut" machining process can fully guarantee the parallelism of each grid plate and the parallelism between each grid plate and the generatrix of the outer cylindrical surface of the collimator unit; the accuracy of the collimator unit is fully guaranteed by the machining tool, the quality is controllable, and the consistency and interchangeability of the products are good. Attached Figure Description

[0040] To more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are merely exemplary, and those skilled in the art can derive other embodiments based on the provided drawings without creative effort.

[0041] The structures, proportions, sizes, etc. illustrated in this specification are only for the purpose of assisting those skilled in the art in understanding and reading the content disclosed herein, and are not intended to limit the conditions under which the present invention can be implemented. Therefore, they have no substantial technical significance. Any modifications to the structure, changes in the proportions, or adjustments to the size, without affecting the effects and objectives that the present invention can produce, should still fall within the scope of the technical content disclosed in the present invention.

[0042] In the attached diagram:

[0043] Figure 1 A flowchart illustrating the method provided in the embodiments of the specification;

[0044] Figure 2 A schematic diagram of a single high-energy collimator structure provided for the embodiments of the specification;

[0045] Figure 3 This is a schematic diagram of the structure after rough machining;

[0046] Figure 4 This diagram illustrates the centerline and the location of the wire cutting lead hole.

[0047] Figure 5 Design drawing of the high-energy collimator frame;

[0048] Figure 6 This is a schematic diagram of the first tooling component;

[0049] Figure 7 This is a schematic diagram showing the usage status of the first tooling component;

[0050] Figure 8 This is a schematic diagram of the second tooling component.

[0051] Figure 9 Schematic diagram of the second tooling component in use

[0052] Figure 10 This is a schematic diagram of a tantalum plate being horizontally inserted into a groove.

[0053] Figure 11 This is a schematic diagram of the high-energy collimator under acceptance conditions. Detailed Implementation

[0054] To make the objectives, technical solutions, and advantages of this application clearer, the technical solutions of this application will be clearly and completely described below in conjunction with specific embodiments and corresponding drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of them. Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0055] The technical solutions provided by the various embodiments of this application are described in detail below with reference to the accompanying drawings.

[0056] This embodiment provides a method for fabricating a high-energy collimator. Please refer to [link to relevant documentation]. Figure 1 As shown, it includes:

[0057] S001. Prepare the first bar stock, the perpendicularity of its two end faces to the generatrix is ​​not greater than 0.1mm, and one end face has an outward convex edge forming a flange structure.

[0058] In practice, the methods for preparing bar stock include, but are not limited to, the following:

[0059] 1011. Material feeding

[0060] Specifically, cut a 315mm length from a Φ250mm hard aluminum alloy (LY12 or LF6) bar, ensuring that the perpendicularity of both end faces to the cylindrical generatrix is ​​no greater than ±2mm.

[0061] 1012, Rough Car

[0062] Specifically, the material is processed into the first bar stock according to the drawings. For example... Figure 3 Machining to the dimensions shown ensures that the perpendicularity of both end faces to the cylindrical generatrix is ​​no greater than ±0.1mm. The Φ209 end face is machined to the cylindrical generatrix in a single clamping operation. The Φ220mm process boss 'a' in the middle is used for milling the end face.

[0063] S002. A plurality of wire cutting holes are drilled on the end face of the first bar, extending to the other end. Each wire cutting hole is parallel to the axis of the first bar. The plurality of wire cutting holes are on the same horizontal plane as the axis of the first bar and are spaced apart to form a second bar.

[0064] In specific implementation, such as Figure 4 As shown, mark the center lines of both end faces and the center lines of the wire cutting lead holes: Place the cylindrical material with its axis parallel to the platform, and mark the center lines parallel to the platform on both end faces; using an angle gauge, rotate it 90° around the axis and mark another center line and the center line of the lead hole on each end, ensuring the consistency of the marked lines at both ends and the parallel / perpendicular relationship between the center lines. Drill the wire cutting lead holes: Drill holes of Φ8mm to Φ10mm from both ends, making sure they are through. (Specific dimensions can be marked according to the construction drawings, and are not limited here).

[0065] S003. The second bar stock is heat-treated to form the third bar stock;

[0066] In practice, heat treatment methods include, but are not limited to, holding at 120±5℃ for 4 hours, naturally cooling in the furnace, and removing from the furnace after 24 hours.

[0067] S004. The third bar is wire-cut according to the first design requirements to obtain a first prototype.

[0068] In practical implementation, the first design requirement includes, but is not limited to, leaving a 1mm allowance on one side, i.e., machining the inner circle to Φ186.4mm, machining the main grid plate to 4mm, ensuring the concentricity of the inner and outer circular surfaces is no greater than ±0.1mm, and the perpendicularity of all wire-cut surfaces relative to the flange end face is no greater than ±0.1mm. Specifically, such as according to Figure 5 The structure shown is wire-cut to obtain the first prototype, specifically the first prototype of the collimator frame.

[0069] For example, the wire cutting wire is passed through the circular hole of the wire cutting lead hole and fixed at the top and bottom. The machine is turned on for wire cutting. To improve cutting efficiency, a fast wire cutting machine can be used. First, cut along the center line to the edge, and then cut clockwise (or counterclockwise). The power should be adjusted appropriately to avoid wire breakage and uneven cutting in some areas. Leave a 1mm allowance for secondary wire cutting on each side of the wall thickness. After cutting one cavity, re-thread the wire. When cutting another cavity, it is best to cut symmetrically rather than sequentially to ensure that the material stress is released symmetrically and evenly, and to avoid the outer cylinder becoming elliptical after cutting. Finally, the third bar is cut into a cylindrical structure 01 with multiple spaces divided by multiple main grid plates 2 inside, and through both ends. Slots for inserting tantalum plates 03 are cut on each main grid plate and inside the cylinder wall (not shown in the figure). After the main grid plates are cut, the wire is re-threaded. A calibration equipment mounting slot 04 is cut at the end of the first bar near the edge. The mounting slot 04 is not connected to the space divided by the main grid. The specific size of the mounting slot is set according to the usage and is not limited here. It formed its first prototype.

[0070] It should be understood that the specific related content listed above is for illustrative purposes only and should not be construed as limiting the scope of this application.

[0071] S005. The first prototype is subjected to heat treatment to obtain the second prototype;

[0072] In practice, heat treatment methods include, but are not limited to, holding at 120±5℃ for 4 hours, naturally cooling in the furnace, and removing from the furnace after 24 hours.

[0073] S006. Mill the two ends of the second prototype according to the second design requirements to obtain the third prototype;

[0074] In practice, the two ends of the second prototype are milled. Specifically, a Φ220mm process boss is mounted, and the overall height is machined to [specific dimensions]. Mill the center recesses on both end faces to a depth of 1 ± 0.1 mm (Φ188.4 ± 0.1 mm). Mill the flange from Φ241 mm to Φ238 mm.

[0075] S007. Perform semi-finish turning on the outer circle of the third prototype to obtain the fourth prototype;

[0076] In practice, when machining the outer diameter of each part, a 1mm allowance is left. Specifically, during the semi-finish turning of the third prototype, the third prototype is fixed in the first tooling, and the first working piece is as follows: Figure 6 As shown, it includes two discs 11 that press against the two ends of the collimator, and four tie rods 12 that pass through the collimator. After the fixture is installed, it is as follows... Figure 7 The concentricity of the two disks is 0.01 mm, and the parallelism is no greater than 0.01 mm.

[0077] S008. Heat-treat the fourth prototype to obtain the fifth prototype;

[0078] In practice, heat treatment methods include, but are not limited to, holding at 120±5℃ for 4 hours, naturally cooling in the furnace, and removing from the furnace after 24 hours.

[0079] S009. According to the third design requirements, wire cut the inner cavity of the fifth prototype to process the fifth prototype to the final size requirements and obtain the sixth prototype.

[0080] In practice, the fifth prototype is fixed to the second tooling. The inner barrel wall, main grid plate, and slots are precision machined to their final dimensions according to the requirements of the attached drawings. The inner surfaces of the cavities and slots are cut sequentially in one operation, avoiding wire changes within the same cavity. Ensure that the parallelism of all slots, the perpendicularity of the slots to the flange end face, and the concentricity of the inner and outer circular surfaces all meet the drawing requirements. Ensure the slot width of the tantalum plate is 0.18±0.02mm. Clean thoroughly after wire cutting. Figure 8 As shown, the second tooling includes, but is not limited to, two plates 21 fixedly connected by a connecting rod 22, the two plates being spaced apart, each plate having a through hole 23, the inner diameter of the through hole 23 being larger than the outer diameter of the fifth prototype and smaller than the outer diameter of the flange of the fifth prototype. Figure 9 As shown, one end of the fifth prototype can be inserted into the through hole 23.

[0081] Specifically, the wire cutting method involves first accurately positioning the outer circle of the collimator on the wire cutting machine, then passing the cutting wire through the inner cavity to perform high-precision slow wire cutting with a small cutting amount, and cutting the cavity symmetrically. Careful operation is required, cutting clockwise (or counterclockwise) as well. The power supply needs to be adjusted appropriately to avoid wire breakage and uneven cutting in certain areas, to prevent deformation of thin-walled grids, and to ensure uniform grid thickness.

[0082] It should be understood that the specific details listed above are for illustrative purposes only and should not be construed as limiting the scope of this application.

[0083] S010. Perform finishing on the sixth prototype, open the end flange and deburr to obtain the collimator frame;

[0084] In practice, for precision machining of the outer diameter: use the first tooling piece, and the clamping method is the same as that for the semi-precision machining process. Ensure that the perpendicularity between the outer diameter generatrix and the flange end face is no greater than 0.015mm after machining, and the out-of-roundness of the outer diameter surface is no greater than ±0.02mm.

[0085] Machining flange holes: Drill 6 Φ5.5mm through holes, mill Φ10mm countersunk holes with a depth of 5mm; drill two Φ4mm pin holes to ensure dimensional accuracy. Remove all burrs.

[0086] S011. Cut tantalum plates according to the design drawings;

[0087] In practice, the tantalum plate can be processed before, during, or after the collimator frame is processed. This application is merely an example to illustrate the process, and therefore the specific processing sequence should not be a limitation of this application.

[0088] Specifically, 506 tantalum plates are wire-cut, 0.15mm thick, 298mm long, and available in 69 different widths; the four corners are rounded with a radius of 1mm, and the width can have a negative tolerance of 0.05mm. The long edge of each plate is slightly polished to remove burrs. The flatness of each tantalum plate is checked on a platform. A Φ1mm hole is drilled at one end of the horizontal insert plate for threading the guide wire when inserting into the slot.

[0089] S012. Insert the cut tantalum plate into the collimator frame to complete the collimator fabrication.

[0090] In practice, thoroughly clean the aluminum alloy frame W with CCl4. Place it horizontally on the V-shaped iron M, ensuring the main grille is perpendicular to the table surface, as shown. Figure 10 Insert the tantalum plate horizontally into the slot. Mix the two components of E2019 rubber-toughened epoxy resin evenly in proportion and apply it to the main grid plate and the inner wall of the collimator barrel using a syringe. Insert the mounting plate, apply pressure, and adhere the mounting plate to the main grid plate and the inner wall of the collimator barrel, allowing the epoxy resin to automatically flow into the slot. Cure at 70°C for 1 hour, or at room temperature for 7 days (this epoxy resin reaches 80% strength in 24 hours). This forms a high-energy collimator monomer, such as... Figure 2 As shown.

[0091] To verify the above method, a FUTURE-1076 three-coordinate measuring instrument (with a measurement indication error ≤3.5μm, repeatability of 2.5μm, and probe pressure of 6g) was used to measure the aluminum alloy frame. The test method is described in the "Measuring Specification for Mechanical Accuracy of High-Energy Collimators for Hard X-ray Modulation Telescopes (HXMT)".

[0092] Please see Figure 11 As shown, the ellipticity error of the two outer cylindrical surfaces C (Φ206mm) and D (Φ205mm) is ≤0.01mm;

[0093] The perpendicularity error between the axes of the cylindrical surfaces C and D and the flange surface A is ≤0.5 degrees; the flatness error between surface B and surface A is ≤0.2 degrees; and the perpendicularity error between the collimation hole and surface A is ≤0.5 degrees.

[0094] The parallelism error between each collimation hole is ≤0.5'.

[0095] The center and ellipticity (maximum difference between the maximum and minimum radii) of the reference outer cylindrical surfaces C and D.

[0096] Measurement location Center coordinates (X, Y, Z) Average diameter Φ MaxΔR C-side (Φ206) 775.3601,453.8483,-296.8407 205.9836 1.3μm D side (Φ205) 526.8467,453.8424,-296.8431 204.9905 3.2μm

[0097] The perpendicularity of the upper and lower end faces of the flange to the axis of the collimator (the angle between the normals of the flange's A and B faces and the axis).

[0098]

[0099] Angle between the plane of each tantalum plate and the collimator axis

[0100] Tantalum plate number The angle between the tantalum plate and the collimator axis The angle between the front and rear tantalum plates and surface A. 1# front, back 0.067850,0.0097582 89.931622,89.901890 2# front, back 89.927528,89.956625 3# front, back 89.951077,89.995735 4# front, back 89.943989,89.983763 5# front, back 89.987356,89.978651 4# Full Plane 0.002516 89.996956

[0101] Note: Due to the short probe length, which only extends 10mm into the collimator, planar fitting was performed separately for the data from the front and rear ends of the tantalum plate. For tantalum plate #4, a combined measurement of the front and rear end data was performed, and a full-plane fitting was conducted, resulting in better reliability.

[0102] The above measured data show that the wire EDM machine can ensure a machining accuracy within 0.03mm; the special tooling and "one-time" machining processes can fully guarantee the parallelism of each main grid plate and the parallelism between each main grid plate and the generatrix of the outer cylindrical surface of the collimator unit; the aluminum alloy frames manufactured using the above processes all meet the acceptance requirements. Dynamic environmental tests and thermal cycling tests also show that the E2019 rubber-toughened epoxy resin adhesive has excellent flexibility.

[0103] The advantages of the aluminum alloy frame with tantalum plate mounting scheme are: ① The accuracy of the collimator unit is fully guaranteed by the machine tool, the quality is controllable, and the consistency and interchangeability of the products are good; ② With the support of the aluminum alloy frame, it is easy to ensure the parallelism between the tantalum plates and their parallelism with the outer cylindrical surface of the collimator unit; ③ The collimator unit has high mechanical strength, which can easily meet the requirements of dynamic environment test and thermal cycling test; ④ The cost of the collimator unit is low.

[0104] To better implement this embodiment, the embodiment also provides a method for processing the first tooling part, including: processing the large disc: taking a hard aluminum plate with a diameter of 275.40mm and a thickness of 40mm, clamping it to the 10mm position on a lathe using a three-jaw chuck, and machining the remaining 30mm outer diameter to 270mm, and machining a concave surface with a diameter of 23800..0001 and a depth of 7mm at the center of the end face; then clamping the 30mm end with a three-jaw chuck, and machining away the remaining 10mm thickness. After processing, the ellipticity of its outer diameter, the flatness of its end face, and the concentricity of its inner and outer diameters are all controlled to be around 0.002mm; finally, drilling four Φ10 through holes, the drilling positions ensuring that they can connect to the small disc and pass through the aluminum main grid of the collimator.

[0105] Machining the small disc: Take a Φ210mm, 40mm thick hard aluminum sheet, clamp it to the 10mm position on a lathe using a three-jaw chuck, and machine the remaining 30mm outer diameter to Φ205mm, chamfer the edges, and machine a Φ188.2mm concave surface with a depth of 1mm at the center of the end face; then clamp the 30mm end with a three-jaw chuck and machine away the remaining 10mm thickness, the flatness of the end face can be controlled to about 0.002mm; then drill four M10 threaded holes, corresponding to the large disc; finally, place the small disc on a horizontal rotary table, use a dial indicator to drill the outer diameter, find the center line position of the circle and scribing it, and use a special center drill to drill the center hole. If it is to be reused multiple times, a steel sleeve can be inserted to make the center hole.

[0106] Connecting rods: four Φ10mm rods, with M10 threads at both ends.

[0107] Installation and debugging: Install the collimator into the fixture and place the whole assembly on the horizontal turntable. Use a dial indicator to check the outer circles at both ends of the fixture to ensure the concentricity of the two outer circles. Tighten the fixture bolts. Then, clamp the large disc of the fixture onto the lathe's three-jaw chuck. Use a dial indicator to check the exposed outer circle and end face of the large disc to ensure it is clamped correctly.

[0108] Application: It can protect the tooling from external forces and is reusable.

[0109] To better implement this embodiment, a second tooling processing method is also provided. The upper and lower plates are 400mm × 400mm × 15mm in size, with a central hole of Φ205mm. Four rods are Φ25mm in diameter, with M16 threads machined on both sides. The length of the smooth rod is 250±0.03mm. The steps at both ends of the smooth rod ensure the parallelism of the upper and lower plate planes. The position of the rod is based on the principle of being as far inward as possible without affecting the installation of the collimator. After the tooling is installed, the distance from the upper surface of the upper plate to the lower surface of the lower plate is 280mm. Then, the upper plane is milled to achieve a parallelism of 0.02mm between the two planes.

[0110] Installation and debugging: Press the lower plate edge on the outside of the rod against the wire cutting table, and wire cut the two center circular holes to... To ensure concentricity, install the collimator while keeping the fixture stationary, and only remove it after the entire precision cutting process is completed.

[0111] Application: When mass-producing collimators, this fixture must remain in place until all collimators are precision-cut. If producing individual collimators sporadically, a new fixture needs to be fabricated for each collimator.

[0112] It should also be noted that the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0113] It should also be noted that the terms "first" and "second" in this application are used to distinguish multiple objects with the same name, and are not used to limit the order or size. Unless otherwise specified, they have no other special meaning.

[0114] The above description is merely an embodiment of this application and is not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principle of this application should be included within the scope of the claims of this application.

Claims

1. A method of fabricating a high energy collimator, the method comprising: The application relates to a method for manufacturing a collimator frame. ​ The method comprises the following steps: preparing a first rod material, the two end faces of which are perpendicular to a busbar with a perpendicularity of not more than 0.1 mm, and one of the end faces is outwardly protruded to form a flange structure; punching a plurality of wire cutting holes on the end face of the first rod material, the wire cutting holes penetrating to the other end, each wire cutting hole is parallel to the axis of the first rod material, the plurality of wire cutting holes are arranged on the same horizontal plane of the axis of the first rod material, and are spaced apart to form a second rod material; performing heat treatment on the second rod material to form a third rod material; performing wire cutting on the third rod material according to a first design requirement to obtain a first rough shape, which comprises the following steps: cutting the third rod material into a cylindrical structure penetrating at two ends and internally divided into a plurality of spaces by a plurality of main grid plates, and cutting a plurality of insertion grooves for inserting tantalum plates on each main grid plate and in the wall of the cylinder; performing heat treatment on the first rough shape to obtain a second rough shape; milling the two end faces of the second rough shape according to a second design requirement to obtain a third rough shape; performing semi-precision machining on the outer circle of the third rough shape to obtain a fourth rough shape; performing heat treatment on the fourth rough shape to obtain a fifth rough shape; performing wire cutting on the inner cavity of the fifth rough shape according to a third design requirement to process the fifth rough shape to a final size requirement, and obtaining a sixth rough shape, wherein the third design requirement comprises: processing the inner barrel wall, the main grid plate and the insertion groove to the final size according to the drawing requirement, sequentially cutting the inner cavity surface and the insertion groove at one time, and avoiding wire changing in the same cavity; performing precision machining, end flange hole opening and deburring on the sixth rough shape to obtain a collimator frame; cutting tantalum plates according to a design drawing; 2. The method of claim 1, wherein, inserting the cut tantalum plates into the collimator frame to complete the manufacturing of the collimator.

3. The method of claim 1, wherein, The diameter of the wire cutting hole is 8 mm to 10 mm. The heat treatment mode comprises the following steps: keeping the temperature at 110 DEG C to 130 DEG C for 3 to 5 hours; naturally cooling in the furnace; 4. The method of claim 1, wherein, taking out the furnace after a predetermined time. The first design requirement comprises the following steps: leaving a single-side thickness allowance of at least 1 mm; processing the thickness of the main grid plate to at least 4 mm; ensuring that the concentricity of the inner and outer circles is not more than + / -0.1 mm; 5. The method of claim 1, wherein, ensuring that the perpendicularity of all wire cutting surfaces to the flange end face is not more than + / -0.1 mm. The second design requirement comprises the following steps: processing the second rough shape to a preset height; milling a recess table on the two end faces of the second rough shape; 6. The method of claim 1, wherein, milling the flange to a preset size.

7. The method of claim 6, wherein, Before performing semi-precision machining on the outer circle of the third rough shape, the third rough shape is fixed on a first tooling piece.

8. The method of claim 1, wherein, The first tooling piece comprises two discs for pressing the two end faces of the collimator and four pull rods penetrating through the collimator, and the four pull rods are fixedly connected with the two discs.

9. The method of claim 8, wherein, Before performing wire cutting on the inner cavity of the fifth rough shape, the fifth rough shape is fixed on a second tooling piece. The second tooling piece comprises: two plate bodies fixedly connected through connecting rods, the two plate bodies are arranged at intervals, each plate body is provided with a through hole, the inner diameter of the through hole is greater than the outer diameter of the fifth rough shape and smaller than the outer diameter of the flange of the fifth rough shape.

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