CN116619636A - A kind of manufacturing method of G10 elbow for superconducting magnet coil frame - Google Patents

Abstract

The invention discloses a method for manufacturing a G10 bent pipe used for a coil frame of a superconducting magnet. The bent pipe adopts glass fiber as a reinforcing base material, and is heated and pressurized in a mold by pre-impregnating epoxy resin. It mainly includes the following steps: 1) Processing mold: design and process the mold according to the shape and size of the pipe body; 2) Prepare materials: cut the glass fiber cloth into glass fiber strips according to the size of the mold core, and pre-impregnate the glass fiber strips with epoxy Resin; 3) Sticking strips: Paste the glass fiber strips pre-impregnated with epoxy resin on the surface of the mold core in turn; 4) Clamp the mold, cure and form; the mold core after sticking the strips is placed in the mold cavity, pressurized and heated , curing and molding; 5) demoulding, trimming surface flashes and burrs. The invention has the advantages that: the pipe body adopts glass fiber as a reinforcing base material, and is heated and pressurized in a mold by pre-impregnating epoxy resin to ensure the precision and compactness of the pipe body.

Description

A kind of manufacturing method of G10 elbow for superconducting magnet coil frame

technical field

The invention belongs to the technical field of production of superconducting magnet accessories, and in particular relates to a method for manufacturing a G10 elbow used for a coil frame of a superconducting magnet.

Background technique

Heavy ion therapy devices are complex in technology, huge in equipment, and expensive in construction and operation, which have become the main obstacles restricting the development and promotion of heavy ion therapy devices. Therefore, miniaturization and light weight of the huge treatment device is the main development direction of the radiotherapy device.

In the miniaturization technology of heavy ion therapy equipment, the use of superconducting magnet technology is an inevitable choice. Compared with conventional magnets, superconducting magnets have two obvious advantages. First, superconducting magnets adopt a pure coil structure, which eliminates the huge iron core. If necessary, the iron core only serves to shield the leakage field and improve the quality of the magnetic field. Compared with the original structure, the size and weight are greatly reduced. Under the condition of generating the same magnetic field, the weight of the superconducting magnet is at least an order of magnitude smaller than that of the conventional magnet; Under the premise of ensuring the magnetic stiffness, the deflection radius is reduced, which effectively reduces the overall size of the magnet.

G10 is a composite material made of glass fiber cloth and epoxy resin, which can withstand great strength without damage and deformation; it will not be penetrated by water vapor and liquid; it has low density, high strength, insulation, Acid and alkali resistance, so it becomes the material of choice for superconducting coil skeleton. However, the G10 tube is an arc-shaped hollow tube, and the existing processing equipment cannot process the inner wall of the G10, resulting in a rough inner wall and low precision, thereby affecting the performance of the superconducting magnet coil skeleton.

Contents of the invention

The invention provides a method for manufacturing a G10 bent pipe used for a coil frame of a superconducting magnet. The purpose is to solve the problem that the inner wall of the G10 tube prepared by the existing process is rough and the precision is low, which affects the performance of the coil frame of a superconducting magnet.

For this reason, the present invention adopts following technical scheme:

A method for manufacturing a G10 elbow for a superconducting magnet coil skeleton, comprising the following steps:

1) Processing mold: process the core and outer mold according to the shape and size of the G10 pipe;

The mold core is a solid arc rod, the radian of the mold core is the same as that of the G10 pipe, and the outer diameter of the arc rod is not greater than the inner diameter of the G10 pipe;

The outer mold includes an upper mold and a lower mold. The upper surface of the upper mold is provided with an arc groove with a semicircular cross section, and the lower surface of the lower mold is provided with an arc groove with a semicircular cross section. The arc grooves on the upper mold and the lower mold The grooves are opposite; the arc of the arc groove is the same as that of the G10 pipe, and the diameter of the arc groove is equal to the outer diameter of the G10 pipe;

2) Cutting glass fiber strips: Cut the glass fiber cloth into glass fiber strips according to the length of the mold core, and the glass fiber strips are pre-impregnated with epoxy resin;

3) Mold core sticking strips: stick the glass fiber strips to the surface of the mold core along the length direction of the mold core, arrange the glass fiber strips in sequence, firstly paste the first layer around the mold core, and the adjacent glass fiber strips are next to each other;

Paste the second layer of glass fiber strips on the top of the first layer of glass fiber strips, and the seams of the second layer of glass fiber strips are interlaced with the joints of the first layer of glass fiber strips;

Paste the glass fiber strips of each layer in turn, and the seams between adjacent layers are arranged alternately until the paste reaches the design thickness;

4) Mold closing and curing: Place the mold core pasted with glass fiber strips in step 3) in the arc groove of the lower mold, merge the upper mold, press the mold core on the upper mold, and make the glass fiber strips tightly wrapped in the mold core surface;

Heating to cure the epoxy resin;

5) Demoulding: remove the upper mold, take the mold core out of the lower mold; trim the flash and burrs on the surface of the mold core, remove the mold core, and form the G10 tube with the glass fiber cloth pasted on the surface of the mold core.

Further, the thickness of the glass fiber cloth is 0.08-0.1 mm.

Further, the epoxy resin in step 2) is made of the same material as the epoxy resin poured after the G10 tube is wound with a coil.

Further, in the step 3), the seams of the glass fiber strips and the parting surfaces of the upper mold and the lower mold are misaligned.

Further, in the step 3), when the pasting thickness of the glass fiber strip reaches one-third and two-thirds of the predetermined thickness, and when the predetermined thickness is reached, the tightening belt is used to wrap and press the glass fiber cloth.

Further, the mold core and the outer mold are made of aluminum alloy.

The beneficial effects of the present invention are:

1. The present invention uses glass fiber as a reinforcing base material, and pastes glass fiber strips on the surface of the mold core by pre-impregnating epoxy resin, effectively controlling the smoothness of the inner wall of the G10 tube; forming by heating and pressing ensures the integrity of the G10 tube body precision and compactness;

2. Both the mold core and the outer mold of the present invention are made of aluminum alloy, and the characteristics of the large difference in thermal expansion coefficient between aluminum alloy and G10 are used to improve the compactness of the pipe body and facilitate demoulding;

3. Staggered seams are formed between layers when the glass fiber strips are pasted in the present invention, and the joints are required to avoid the parting surfaces of the upper and lower molds of the outer mold, which is conducive to improving the strength of the pipe body;

4. In the process of pasting, the present invention adopts the method of winding the tightening tape to carry out multiple pre-pressing, which is beneficial to reduce the risk of defects such as shrinkage cavity and looseness when the tube body is solidified, and improves the performance of the G10 tube.

Description of drawings

Fig. 1 is a schematic cross-sectional structure diagram of a superconducting magnet involved in the present invention;

Fig. 2 is the outline schematic diagram of G10 elbow of the present invention;

Fig. 3 is the pasting schematic diagram of G10 elbow glass fiber strip of the present invention;

Fig. 4 is the cross-sectional view after the glass fiber strip of G10 curved pipe of the present invention is pasted;

Fig. 5 is the axonometric view of step 4) of the present invention after mold closing;

Fig. 6 is the sectional view of Fig. 5;

In the figure: 1-beam center tube, 2-first layer bobbin, 3-first layer aluminum ring, 4-second layer coil bobbin, 5-second layer aluminum ring, 6-third layer coil bobbin, 7-Third layer aluminum ring, 8-Fourth layer coil bobbin, 9-Fourth layer aluminum ring, 10-Mold core, 11-G10 elbow, 12-Lower die, 13-Upper die, 14-Arc groove .

Detailed ways

The present invention will be further described below in conjunction with accompanying drawing and specific embodiment:

A method for manufacturing a G10 elbow for a superconducting magnet coil bobbin. The cross-sectional view of the superconducting magnet coil bobbin is as shown in Figure 1. From the inside to the outside, it is the beam center tube 1, the first layer of coil bobbin 2, the first Layer aluminum ring 3, second layer coil skeleton 4, second layer aluminum ring 5, third layer coil skeleton 6, third layer aluminum ring 7, fourth layer coil skeleton 8, fourth layer aluminum ring 9, coils of each layer The skeleton material is G10. The structural diagram of the G10 elbow 11 is shown in Figure 2, and the G10 elbow 11 is an arc-shaped hollow pipe.

The manufacturing method of G10 elbow comprises the following steps:

1) Process the mold: process the mold core 10 and outer mold according to the shape and size of the G10 elbow 11;

As shown in Figures 4 and 5, the mold core 10 is a solid arc rod, the radian of the mold core 10 is the same as that of the G10 elbow 11, and the outer diameter of the arc rod is not greater than the inner diameter of the G10 elbow 11; when subsequent heating and curing must be considered, The inner diameter of the mold core 10 increases due to thermal expansion, so the expansion of the mold core 10 needs to be calculated according to the material, size and heating temperature of the arc rod; the size of the mold core 10 designed here is a G10 elbow 11 Gauge ID minus expansion.

The outer mold includes an upper mold 13 and a lower mold 12. The upper surface of the upper mold 13 is provided with an arc groove 14 with a semicircular cross section, and the lower surface of the lower mold 12 is provided with an arc groove 14 with a semicircular cross section. The upper mold 13 It is opposite to the arc groove 14 on the lower die 12; the arc of the arc groove 14 is the same as the G10 elbow 11, and the diameter of the arc groove 14 is equal to the outer diameter of the G10 elbow 11.

It should be noted that the mold core 10 and the outer mold are made of aluminum, because the thermal expansion coefficient of aluminum is much greater than G10, and in the subsequent heating and solidification process, the mold expands and further compacts the pipe body; after cooling, the mold core 10 shrinks, which facilitates removal. mold.

2) Cutting glass fiber strips: Cut the glass fiber cloth into glass fiber strips according to the length of the mold core 10, and the glass fiber strips are pre-impregnated with epoxy resin.

The thickness of the glass fiber cloth is 0.08-0.1mm; the glass fiber strips are pasted along the axial direction of the mold core 10, so it is necessary to cut the glass fiber strips with appropriate length and width according to the different lengths of the inner and outer arcs to ensure that the glass fiber strips are flat and wrinkle-free after pasting. In addition, in order to ensure the insulation between turns of the coil and the stability of the overall structure, the epoxy resin in step 2) is made of the same material as the epoxy resin poured after the G10 elbow 11 is wound around the coil.

3) Pasting strips for mold core 10: as shown in Figure 3, paste glass fiber strips on the surface of mold core 10 along the length direction of mold core 10, arrange each glass fiber strip in sequence, first paste the first layer around mold core 10, The adjacent glass fiber strips are next to each other.

Paste the second layer of glass fiber strips on the top of the first layer of glass fiber strips, and the joints of the second layer of glass fiber strips and the joints of the first layer of glass fiber strips are arranged alternately.

Paste each layer of glass fiber strips in turn, and the joints between adjacent layers are arranged alternately until the design thickness is pasted; because the outer mold is a structure of upper and lower molds 12, for the convenience of mold parting, the joints of glass fiber strips are connected with the upper mold 13 and the lower mold. 12 parting surface dislocation processing.

In order to improve the density and smoothness of the G10 elbow 11, when the pasting thickness of the glass fiber strip reaches one-third and two-thirds of the predetermined thickness, and when the predetermined thickness is reached, the tightening belt is used to wrap and press the glass fiber cloth, To compact the glass fiber strips.

4) Mold clamping and curing: as shown in Figures 5 and 6, place the mold core 10 pasted with glass fiber strips in step 3) in the arc groove 14 of the lower mold 12, merge the upper mold 13, and apply pressure on the upper mold 13 Tighten the mold core 10 so that the glass fiber strips are tightly wrapped on the surface of the mold core 10;

Heating cures the epoxy resin into shape.

5) Demoulding: remove the upper mold 13, take the mold core 10 out of the lower mold 12; trim the flash and burrs on the surface of the mold core 10, remove the mold core 10, and form the G10 elbow with the glass fiber cloth pasted on the surface of the mold core 10 11.

Claims (6)

1. A method for manufacturing a G10 elbow for a superconducting magnet bobbin, characterized in that it may further comprise the steps: 1) Process mold: Process the core (10) and outer mold according to the shape and size of the G10 elbow (11); The mold core (10) is a solid arc rod, the radian of the mold core (10) is the same as that of the G10 elbow (11), and the outer diameter of the arc rod is not greater than the inner diameter of the G10 elbow (11); The outer mold includes an upper mold (13) and a lower mold (12). The upper surface of the upper mold (13) is provided with an arc groove (14) with a semicircular cross section, and the lower surface of the lower mold (12) is provided with a semicircular cross section. Shaped arc groove (14), the arc groove (14) on the upper mold (13) and the lower mold (12) is opposite; the arc of the arc groove (14) is the same as the G10 elbow (11), and the circle The diameter of the arc groove (14) is equal to the outer diameter of the G10 elbow (11); 2) Cutting glass fiber strips: Cut the glass fiber cloth into glass fiber strips according to the length of the mold core (10), and the glass fiber strips are pre-impregnated with epoxy resin; 3) Mold core sticking strips: stick the glass fiber strips to the surface of the mold core (10) along the length direction of the mold core (10), arrange the glass fiber strips in sequence, and paste the first layer around the mold core (10) first, adjacent The glass fiber strips are next to each other; Paste the second layer of glass fiber strips on the top of the first layer of glass fiber strips, and the seams of the second layer of glass fiber strips are interlaced with the joints of the first layer of glass fiber strips; Paste the glass fiber strips of each layer in turn, and the seams between adjacent layers are arranged alternately until the paste reaches the design thickness; 4) Mold clamping and curing: place the mold core (10) pasted with glass fiber strips in step 3) in the arc groove (14) of the lower mold (12), merge the upper mold (13), and apply Press the mold core (10) tightly so that the glass fiber strips are tightly wrapped on the surface of the mold core (10); Heating to cure the epoxy resin; 5) Demoulding: remove the upper mold (13), take out the mold core (10) from the lower mold (12); trim the flash and burrs on the surface of the mold core (10), remove the mold core (10), mold core (10) 10) Surface-bonded glass fiber cloth to form a G10 elbow (11). 2 . The method for manufacturing the G10 elbow used for the coil frame of a superconducting magnet according to claim 1 , wherein the thickness of the glass fiber cloth is 0.08-0.1 mm. 3. The method for manufacturing a G10 elbow for a superconducting magnet coil frame according to claim 1, characterized in that the epoxy resin in step 2) and the epoxy resin poured after the G10 elbow (11) is wound around the coil The resin material is the same. 4. The method for manufacturing a G10 bent pipe for superconducting magnet coil bobbins according to claim 1, characterized in that, in step 3), the seams of the glass fiber strips are connected with the upper mold (13) and the lower mold ( 12) Parting surface dislocation treatment. 5. The method for manufacturing the G10 bent pipe used for the coil frame of a superconducting magnet according to claim 1, characterized in that, in the step 3), the pasting thickness of the glass fiber strip reaches one-third and one-third of the predetermined thickness When the second time, and when the predetermined thickness is reached, the tightening belt is used to wrap and press the glass fiber cloth. 6 . The method for manufacturing the G10 elbow used for the coil frame of a superconducting magnet according to claim 1 , wherein the mold core ( 10 ) and the outer mold are made of aluminum alloy. 7 .