JP2022148978A - Multiple cell acceleration cavity manufacturing apparatus, multiple cell acceleration cavity manufacturing method, and multiple cell acceleration cavity - Google Patents

Abstract

To provide a high-performance multiple cell acceleration cavity which dispenses with welding and is manufactured simply and inexpensively, a manufacturing apparatus of the multiple cell acceleration cavity, and a manufacturing method of the multiple cell acceleration cavity.SOLUTION: A multiple cell acceleration cavity manufacturing apparatus 1 comprises a die unit 2 and a cylinder 5. The die unit 2 is selectively composed of a cell-shaped first die 3 having a space thereinside and a material tube-shaped second die 4 disposed on the left or/and the right of the first die 3 and having a space thereinside, and housing the material tube. The cylinder 5 is disposed at one or both ends of the second die 4, movable toward the first die 4, and provided with a channel through which a liquid fed into the space in the material tube housed in the die unit 2 passes. The device forms a cell shape in the material tube with the fluid pressure of the liquid and a pressing force applied to the material tube with the movement of the cylinder 5. The formation of the cell shape with the fluid pressure of the liquid and the movement of the cylinder 5 is performed every increase in the number of the first die 3 until a desired number of cells are formed, the formation performed a plurality of times separately in order.SELECTED DRAWING: Figure 1

Description

TECHNICAL FIELD The present invention relates to a high-performance multi-cell accelerating cavity which does not require welding, is easy to manufacture at low cost, and a manufacturing apparatus therefor, and also relates to a method for manufacturing a multi-cell accelerating cavity.

The multi-cell acceleration cavity is a superconducting high-frequency acceleration cavity 1, as shown in FIG. A multiple cell 2 made of niobium and having a constriction 4 called an iris for passing a beam through and accelerating particles and cells 5 alternately connected, and end group parts 3 connected to both ends of the multiple cell 2. Consists of note that,

The end group parts 3 are composed of ports (beam pipe, port pipe) for power input and monitoring, HOM (harmonic) couplers having a complicated shape, and the like.

As a method of manufacturing the superconducting high-frequency acceleration cavity 1 of the multiple cells 2, pure niobium sheet metal is formed into half-cells by press working, and these half-cell groups are successively joined by electron beam welding to form a dumbbell shape, which is further dumbbell shaped. The electron beam method of joining them by electron beam welding has been technically established.

However, the electron beam method has a problem that a bead remains due to electron beam welding at the equator (maximum diameter portion 5b) of the completed superconducting high frequency acceleration cavity. If the bead is formed in the direction perpendicular to the direction of the electric field at the equator of the superconducting high-frequency accelerating cavity, it is a major cause of deterioration in the performance of the accelerating cavity. For this reason, the electron beam method has the problem that a process for polishing the bead smoothly is required and the welding time is long.

Electron beam welding was indispensable in the manufacturing method of the electron beam type acceleration cavity. Also, before welding, parts such as half cells and beam pipes must be formed with high precision. Chemical polishing of the groove is required before welding, and electrolytic polishing of the acceleration cavity inner surface is required after welding. As described above, electron beam welding requires a great deal of labor and time, and is not preferable in terms of the production cost of the accelerated cavity.

Therefore, the method of Patent Document 1, and prior to Patent Document 1, the acceleration cavity molding methods of Patent Documents 2 to 4 using moving dies were also studied. However, until now, a method for manufacturing an acceleration cavity that is easy to manufacture, inexpensive, and high performance has not yet been established.

In the techniques of Patent Documents 2 and 3, in order to manufacture an accelerating cavity composed of nine multiple cells, a pipe material having constrictions formed continuously in the axial direction of the pipe is used, and a plurality of movable joints are used at each constriction position. The split molds are placed and loaded into the cylindrical cover, and pressurized liquid is introduced into the interior of the pipe material to press each movable split mold to shorten the pipe. As molding progresses, the split molds come together and the pipe is pressed into the mold to form a bulge.

Patent Documents 2 and 3 have the following problems.
(1) A necking process is required to prepare a pipe material in which constrictions are continuously formed in the axial direction of the pipe. It is difficult to process nine constrictions with good pitch accuracy. Also, the necking process takes time.
(2) It is necessary to expand the tube by 60% or more in the radial direction, and hydroforming is performed in two stages. Therefore, two types of molds are required.

JP 2016-046214 A Japanese Patent Application Laid-Open No. 2001-143898 Japanese Patent Application Laid-Open No. 2001-196200 JP 2008-055428 A

SUMMARY OF THE INVENTION Accordingly, it is an object of the present invention to provide a high-performance multi-cell accelerating cavity that does not require welding, is easy to manufacture at a low cost, and a manufacturing apparatus for the same, as well as a method for manufacturing a multi-cell accelerating cavity.

In order to solve the above problems, the present inventors conducted research on the manufacture of accelerated cavities by hydroforming, and developed a fixed mold that is simpler and more productive than the conventional hydroforming of multiple cells using a moving mold. We discovered a method of forming a cell shape by using plastic flow of the raw material pipe by increasing the axial pushing force.
If the number of cells is one, it can be easily molded, but it is necessary to devise ways to mold multiple cells. A plurality of processes made it possible to mold multiple cells by partially exchanging molds between processes. Thereby, the productivity of the acceleration cavity can be improved.

More specifically,
(1)
A multiple cell acceleration cavity manufacturing apparatus for forming a multiple cell acceleration cavity from a single material tube,
Selecting and assembling from a desired number of first molds having a cell shape and having a space inside, and a second mold having a material tube shape and having a space inside, which is arranged to the left and/or right of the first mold. a mold unit for housing the material pipe;
A flow path arranged at one end or both ends of the second mold, which is movable toward the first mold and is fed into the space of the material tube housed in the mold unit. a cylinder and
consists of
A cell shape is formed in the material pipe by liquid pressure due to the feeding of the liquid and a pressing force applied to the material pipe due to movement of the cylinder,
Each time the number of the first molds is increased, the liquid pressure due to the feeding of the liquid and the movement of the cylinder are used to sequentially form the cell shapes in a plurality of times until the desired number of cell shapes is obtained. A multi-cell accelerated cavity manufacturing apparatus, characterized by:
(2)
With the progress of molding of the cell shape, the second mold,
In order to expose the end of the material tube so that it can be pressed by the cylinder,
The second mold selected from a group of second molds having different lengths,
or
The second mold has a plurality of divided blocks in the longitudinal direction, and the second mold does not include unnecessary divided blocks that hinder the exposure of the material pipe end and the pressing of the cylinder.
The multiple cell acceleration cavity manufacturing apparatus according to (1), characterized by:
(3)
(1) or (2) using the multiple cell acceleration cavity manufacturing apparatus,
A method of manufacturing a multi-cell acceleration cavity, comprising molding the multi-cell acceleration cavity.
(4)
A multiple cell acceleration cavity manufactured by the method for manufacturing a multiple cell acceleration cavity according to (3).
and

The present invention has the following effects. It is possible to provide a high-performance multi-cell accelerating cavity, a manufacturing apparatus thereof, and a method for manufacturing a multi-cell accelerating cavity that do not require welding, are easy to manufacture, and are inexpensive.

FIG. 1 is an explanatory view of the first embodiment (double cylinder type) of the multi-cell acceleration cavity manufacturing apparatus, (A) Cross-sectional schematic diagram of the multi-cell acceleration cavity manufacturing apparatus, (B) Multi-cell acceleration cavity It is an exploded cross-sectional schematic diagram of a manufacturing apparatus, and (C) is a longitudinal cross-sectional schematic diagram of a material pipe. FIG. 2 is an explanatory view of a cell molding process according to the first embodiment of the multiple cell acceleration cavity manufacturing apparatus for molding multiple cell acceleration cavities. FIG. 3 is a schematic cross-sectional view of a multi-cell accelerating cavity formed in Example 1. FIG. FIG. 4 is an explanatory view of the first embodiment (single-cylinder type) of the multi-cell acceleration cavity manufacturing apparatus, (A) Cross-sectional schematic diagram of the multi-cell acceleration cavity manufacturing apparatus, (B) Multi-cell acceleration cavity It is an exploded cross-sectional schematic diagram of a manufacturing apparatus, and (C) is a longitudinal cross-sectional schematic diagram of a material pipe. FIG. 5 is an explanatory diagram of a cell molding process according to a second embodiment of a multiple cell acceleration cavity manufacturing apparatus for molding multiple cell acceleration cavities. FIG. 6 is a schematic cross-sectional view of a multi-cell accelerating cavity formed in Example 2. FIG. FIG. 7 is FIG. 3 of Patent Document 1 and is an explanatory diagram of the acceleration cavity.

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. In addition, the present invention is not limited to the following embodiments.

As shown in FIGS. 1 and 2, a multi-cell acceleration cavity manufacturing apparatus 1 is for forming a multi-cell acceleration cavity from a single material tube 7. A mold unit 2 (2a) and a first It consists of a cylinder 5 and a second cylinder 6 . In addition, FIG. 1 shows a combination of devices for forming the first cell shape of the multi-cell acceleration cavity in the material tube 7 .

The mold units 2, 2a are composed of a desired number of first molds 3 having a cell shape and having a space 3a inside, and a raw material tube shape having a space 4a inside and arranged on the left and right sides of the first mold 3. It is selected from a plurality of types of second molds 4 and 4b with different thicknesses, assembled, and accommodates the material pipe 7. - 特許庁

In FIG. 1, the left and right second molds 4 have the same length. Each mold should be divisible so that the molded product can be removed. The first mold 3 is divided in the lateral direction of FIG. 1 (the direction perpendicular to the cross section of the cell diameter), and the second molds 4 and 4b can be separated by pulling out from the material tube 7 without being divided. You may enable it to divide|segment in parallel.

The first and second cylinders 5 and 6 are arranged on the left and right sides of the second mold 4 or 4b, respectively, and are movable toward the first mold 3. At least one of the first and second cylinders 5 and 6 Here, the second cylinder 6 is provided with a flow path 6a through which the liquid 8 sent into the space 7a of the material tube 7 housed in the mold units 2, 2a passes. Although not shown, a pump is used for feeding the liquid 8 . Further, a necessary seal (not shown) for preventing leakage of the liquid 8 is interposed between the second mold 4, 4b or the material pipe 7. As shown in FIG.

The second mold 4 may have the same length, but in that case, the moving distance of the first and second cylinders 5 and 6 will be long, and multiple types of second molds with different lengths will be produced. It becomes more complicated and expensive than the type group. In addition, when it is necessary to expose the end of the material tube for pressing, when existing equipment is used, and when storage in the pressing space is considered, multiple types of second molds with different lengths are effective. be.

On the other hand, in order to obtain the same effect, there is also a method in which the second mold is made up of a plurality of divided blocks in the longitudinal direction, and the second mold does not include unnecessary divided blocks that hinder the exposure of the material tube end and the pressing of the cylinder. can be adopted. In this case, the process is simplified because only unnecessary division blocks are removed instead of rearrangement.

In the multi-cell accelerated cavity manufacturing apparatus 1 constructed in this way, the cell shape is formed by the pressure applied to the material tube 7 as the first and second cylinders 5 and 6 move and the liquid pressure due to the liquid 8 being sent. Each time the number of the first molds 3 is increased by disassembling and assembling until the desired number of cell shapes is obtained, the liquid pressure due to the feeding of the liquid 8 and the first and second The molding of the cell shape by moving the two cylinders 5 and 6 is divided into a plurality of times and sequentially performed.

In Example 1, the number of cell shapes is three, but the desired number of cell shapes of the multi-cell acceleration cavity can be formed by preparing, sequentially molding, and adding the first molds 3 of the desired number of cells. can be done.

Next, referring to FIG. 2, a method for manufacturing a multi-cell accelerating cavity according to the present invention will be described.
In the present invention, the first mold 3 corresponding to the cell shape and the second molds 4, 4b having different lengths corresponding to the material tube shape are appropriately selected, combined, divided, assembled and used. First, as shown in FIG. 2A, the material tube 7 is inserted into the mold unit 2, and the first and second cylinders 5 and 6 are fitted from the left and right.

Next, as shown in FIG. 2(B), the ends of the material pipe 7 are axially pushed in by the first and second cylinders 5 and 6 which are movable in the direction of the pair of left and right first molds 3 . At the same time, the liquid 8 is sent from the flow path 6a of the second cylinder 6 into the internal space 7a of the material tube 7, and the liquid pressure is applied. By applying pressure to them, one cell shape is expanded into the space 3a of the first mold 3. As shown in FIG.

After one cell shape is molded by the mold unit 2, the liquid 8 is removed, and the first and second cylinders 5 and 6 and the left and right second molds 4 and 4 are removed while the first mold 3 remains in place. As shown in FIG. 2(C), two molds having the same shape as the first mold 3 are placed on the left and right sides of the first mold 3, and the internal shape is the same as that of the second mold 4. After mounting the second mold 4b shorter than the second mold 4, the first and second cylinders 5 and 6 are mounted.

Again, the first and second cylinders 5 and 6 push the ends of the material tube 7 axially. At the same time, the liquid 8 is sent from the flow path 6a of the second cylinder 6 into the internal space 7a of the material tube 7, and the liquid pressure is applied. Two more cell shapes are expanded into the space 3a of the first mold 3 by the pressure. As described above, a triple cell acceleration cavity can be formed as shown in FIG. 2(D).

After molding, the first and second cylinders 5 and 6 are pulled out, the first mold 3 is divided and removed, and the second mold 4b is pulled out in the axial direction of the material pipe 7, whereby the molded product can be taken out. . A triplet multi-cell acceleration cavity 10 formed using the method of manufacturing the multi-cell acceleration cavity of FIG. 2 is shown in FIG.

Although FIG. 2 shows the molding process of a triple cell acceleration cavity, by repeating the above process, it is possible to mold a multi-cell acceleration cavity with four or more cells. A practical 9-cell acceleration cavity can be molded by disassembling and assembling the mold unit 2 four times after molding one cell in the present invention.

As shown in FIGS. 4 and 5, a multi-cell acceleration cavity manufacturing apparatus 11, which is another embodiment, forms a multi-cell acceleration cavity from a single material tube 7, and includes a mold unit 12 ( 12a, 12b), a second cylinder 6 and a lid 15. In addition, FIG. 4 shows a combination of devices for forming the first cell shape of the multiple cell accelerating cavity in the material tube 7 .

The mold units 12, 12a, and 12b are composed of a desired number of first molds 3 having a cell shape and having an internal space 3a, and raw material tube shapes arranged on the left and right sides of the first mold 3 having an internal space 14a. A plurality of types of second molds 14, 14b, 14c, 14d having different lengths are selected and assembled, and the material pipe 7 is accommodated.

In the second embodiment, unlike the first embodiment, the lid 15 is provided instead of the first cylinder 5, and the left and right second molds 14, 14b have different lengths. , forming a cell shape. Each mold should be divisible so that the molded product can be removed. The first mold 3 is divided in the horizontal direction (the direction perpendicular to the cross section of the cell diameter) in FIG. , may be split in parallel to the longitudinal direction.

The second cylinder 6 is arranged on the right side of the second molds 14b, 14c, 14d, is movable toward the first mold 3, and fills the space of the material pipe 7 housed in the mold units 12, 12a, 12b. A channel 6a is provided through which the liquid 8 to be fed into the interior 7a passes. Although not shown, a pump is used for feeding the liquid 8 . Between the second molds 14b, 14c, 14d or the material pipe 7, and between the second mold 14 and the lid 15, necessary seals (not shown) for preventing leakage of the liquid 8 are provided. ) to intervene.

The multi-cell accelerated cavity manufacturing apparatus 11 formed in this way forms the cell shape in the material tube 7 by the liquid pressure due to the liquid supply of the liquid 8 and the pressing force applied to the material tube 7 due to the movement of the second cylinder 6. Each time the number of first molds 3 is increased by disassembling and assembling until the desired number of cell shapes is obtained, the liquid pressure due to feeding the liquid 8 and the cell shape due to the movement of the second cylinder 6 The molding is divided into a plurality of times and performed sequentially.

In Example 2, the number of cell shapes is three, but the desired number of cell shapes of the multi-cell acceleration cavity can be formed by preparing, sequentially molding, and adding the first molds 3 with the desired number of cells. can be done.

Next, referring to FIG. 5, a method for manufacturing a multi-cell accelerating cavity according to the present invention will be described.
In the present invention, the first mold 3 corresponding to the cell shape and the second molds 14, 14b, 14c, 14d having different lengths corresponding to the shape of the material tube are appropriately selected, combined, divided, assembled, and used to form metal molds. Press from one side of the mold. First, as shown in FIG. 5A, the material tube 7 is inserted into the mold unit 12, and the lid 15 and the second cylinder 6 are fitted from the left and right.

Next, as shown in FIG. 5B, the end of the material tube 7 is axially pushed in by the second cylinder 6 which is movable in the direction of the pair of left and right first molds 3 . At the same time, the liquid 8 is sent from the flow path 6a of the second cylinder 6 into the internal space 7a of the material tube 7, and the liquid pressure is applied. By applying pressure to them, one cell shape is expanded into the space 3a of the first mold 3. As shown in FIG.

After one cell shape is molded by the mold unit 12, the liquid 8 is removed, and the second cylinder 6 and the second mold 14b are pulled out while the first mold 3 and the second mold 14 remain in place. As shown in 5(C), a mold having the same shape as the first mold 3 is placed to the right of the first mold 3, and the second mold 14b has the same internal shape as the second mold 14b. After mounting the second mold 14c having a shorter length than the mold 14b, the second cylinder 6 is mounted.

Again, the end of the material tube 7 is axially pushed in by the second cylinder 6 . At the same time, the liquid 8 is sent from the flow path 6a of the second cylinder 6 into the space 7a inside the material tube 7, and the liquid pressure is applied. Due to the pressure, one more cell shape is expanded into the space 3 a of the first mold 3 . As described above, two cells can be formed as shown in FIG. 5(D).

After the two cell shapes are molded by the mold unit 12a, the liquid 8 is removed, and the second cylinder 6 and the second mold 14c are removed while the first mold 3 and the second mold 14 remain in place. As shown in 5(E), another mold having the same shape as the first mold 3 is placed to the right of the first mold 3 on the right side, and the inner shape is the same as that of the second mold 14c. , the second cylinder 6 is mounted after mounting the second mold 14d, which is shorter than the second mold 14c.

Again, the end of the material tube 7 is axially pushed in by the second cylinder 6 . At the same time, the liquid 8 is sent from the flow path 6a of the second cylinder 6 into the space 7a inside the material tube 7, and the liquid pressure is applied. By applying pressure to them, one more cell shape is expanded into the space 3 a of the first mold 3 . As described above, three cells can be formed as shown in FIG. 5(F).

After molding, the second cylinder 6 and the lid 15 are pulled out, the first mold 3 is divided and removed, and the second molds 14 and 14d are pulled out in the axial direction of the material pipe 7, whereby the molded product can be taken out. . A tri-series multi-cell acceleration cavity 20 formed using the multi-cell acceleration cavity manufacturing method of FIG. 5 is shown in FIG.

Although FIG. 5 shows the molding process of a triple cell acceleration cavity, by repeating the above process, it is possible to mold a multi-cell acceleration cavity with four or more cells. A practical 9-cell accelerating cavity can be molded by disassembling and assembling the mold unit eight times after molding one cell in the present invention.

Although the molding process of the multi-cell acceleration cavity 20 is different from that of the first embodiment, the multi-cell acceleration cavity 20 is formed into the same shape as the multi-cell acceleration cavity 10 of the first embodiment.

1 Multi-cell accelerated cavity manufacturing apparatus 2 Mold unit 2a Mold unit 3 First mold 3a Space 4 Second mold 4a Space 4b Second mold 5 First cylinder 6 Second cylinder 6a Channel 7 Material tube 7a Space 8 Liquid 10 Multi-cell acceleration cavity 11 Multi-cell acceleration cavity manufacturing apparatus 12 Mold unit 12a Mold unit 14 Second mold 14a Space 14b Second mold 14c Second mold 14d Second mold 15 Lid 20 Multiple cell acceleration cavity

Claims (4)

A multiple cell acceleration cavity manufacturing apparatus for forming a multiple cell acceleration cavity from a single material tube,
Selecting and assembling from a desired number of first molds having a cell shape and having a space inside, and a second mold having a material tube shape and having a space inside, which is arranged to the left and/or right of the first mold. a mold unit for housing the material pipe;
A flow path arranged at one end or both ends of the second mold, which is movable toward the first mold and is fed into the space of the material tube housed in the mold unit. a cylinder and
consists of
A cell shape is formed in the material pipe by liquid pressure due to the feeding of the liquid and a pressing force applied to the material pipe due to movement of the cylinder,
Each time the number of the first molds is increased, the liquid pressure due to the feeding of the liquid and the movement of the cylinder are used to sequentially form the cell shapes in a plurality of times until the desired number of cell shapes is obtained. A multi-cell accelerated cavity manufacturing apparatus, characterized by: With the progress of molding of the cell shape, the second mold,
In order to expose the end of the material tube so that it can be pressed by the cylinder,
The second mold selected from a group of second molds having different lengths,
or
The second mold has a plurality of divided blocks in the longitudinal direction, and the second mold does not include unnecessary divided blocks that hinder the exposure of the material pipe end and the pressing of the cylinder.
The multi-cell accelerated cavity manufacturing apparatus according to claim 1, characterized by: Using the multi-cell acceleration cavity manufacturing apparatus according to claim 1 or claim 2,
A method of manufacturing a multi-cell acceleration cavity, comprising molding the multi-cell acceleration cavity. A multiple cell acceleration cavity manufactured by the manufacturing method of a multiple cell acceleration cavity according to claim 3.

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