JP4097233B2 - X-ray tube container, method for manufacturing the same, and X-ray tube device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an X-ray tube storage container for storing an X-ray tube, a method for manufacturing the same, and an X-ray tube apparatus.
[0002]
[Prior art]
Conventionally, for example, an X-ray tube apparatus that generates X-rays for medical or other purposes has been used. This X-ray tube apparatus has an X-ray tube in which an electron beam emitting cathode and a cathode that generates X-rays by collision of an electron beam emitted from the cathode are housed in an envelope. Is stored in a storage container for X-ray shielding and insulation.
[0003]
The container for the X-ray tube has a container body made of metal and formed in a cylindrical shape, and is sealed after the X-ray tube is stored in the container body. The container body is formed by general gravity casting in which a molten metal is poured into a mold or sand mold using gravity, or a steel pipe is pressed.
[0004]
In the case of gravity casting using a mold, as shown in FIG. 6, the inner surface of the container body 1 is formed by using one core 2 longer than the axial dimension of the container body 1. . The core 2 has a taper angle of about 1 to 3 degrees that increases in diameter in the die cutting direction a in order to allow die cutting after the container body 1 is formed.
[0005]
[Problems to be solved by the invention]
However, when forming the container body by gravity casting, it takes time to fill the mold with molten metal, so it is not suitable for mass production, and since the filling pressure is low, the filling density is small and the desired strength is achieved. If it is going to obtain, thickness will become thick and it will be easy to produce casting defect.
[0006]
In addition, since the inner surface of the container body is formed by using one core that is long in the axial direction, the inner diameter difference (thickness The difference is very large. Therefore, in the small diameter part of the inner surface of the container main body, the distance from the X-ray tube accommodated in the container main body approaches and lowers the withstand voltage, so that the distance between the container main body and the X-ray tube is secured to a certain level or more. In addition, it is necessary to increase the diameter of the small-diameter portion of the container body by grinding or the like, and it takes time to manufacture the container body.
[0007]
The present invention has been made in view of such points, and in a container main body that accommodates an X-ray tube, it can be thinned after obtaining a desired strength, is easy to manufacture and can be mass-produced, and has poor casting. It is an object of the present invention to provide an X-ray tube container, a method for manufacturing the same, and an X-ray tube device.
[0008]
[Means for Solving the Problems]
Container of the X-ray tube of the present invention, in the container of the X-ray tube housing the X-ray tube, comprising a container body formed in a cylindrical shape by die casting, the outer peripheral surface of the container body, die casting sprue is formed sprue removal section removed of the inner surface of the container body, the two tapered surfaces of each diameter toward both ends in the axial direction is formed. On the inner surface of the container main body, a component mounting portion is formed so as to be able to mount a component housed in the storage container corresponding to the joint of the two tapered surfaces. Taper angle of the tapered surface is under 3 degrees or greater than 0 degrees.
[0009]
A method for fabricating an X-ray tube container of the present invention is a method of manufacturing a container of the X-ray tube housing the X-ray tube, the metal container main body of the container when forming by die casting, the outer peripheral surface of the container body using a pair of the core of each die-cut across the direction of the container body together with the injected molten metal from the sprue being positioned corresponding to 2 divided in the axial direction of the container body, 2 in the axial direction of the container body Using a pair of cores that are divided and die-cut in the both end directions of the container body, two tapered surfaces are formed on the inner surface of the container body so as to expand toward the both ends in the axial direction . At the joint of the two cores, a component mounting portion that protrudes from the inner surface of the container main body and allows mounting of a component housed in the housing container is formed. Child is used in the taper angle for stamping or less 3 times larger than 0 degrees.
[0010]
The X-ray tube device of the present invention includes the X-ray tube storage container and the X-ray tube stored in the storage container.
[0011]
And in the X-ray tube storage container for storing the X-ray tube, by forming the container main body by die casting, the filling density is large, and it is possible to obtain a desired strength and thinning, Manufacturing becomes easier and mass production becomes possible, and casting defects are reduced.
[0012]
Furthermore, by forming the inner surface of the container body using two cores divided in two in the axial direction of the container body, the inner diameter difference of the container body is reduced as compared with the case of forming with one core. Thus, it is not necessary to perform processing for expanding the diameter after the formation, and it becomes possible to manufacture easily. Moreover, a component attachment portion is formed on the inner surface of the container main body at the joint of the two cores, and the components accommodated in the container main body can be accurately positioned and attached. Moreover, by largely 3 degrees or below the taper angle of 0 degree for for demolding of two cores, reducing the inner diameter difference of the container body.
[0013]
Furthermore, by injecting molten metal from the spout located corresponding to the outer peripheral surface of the container body, the filling distance from the sprue compared to the case where the spout is positioned corresponding to the axial end of the container body To reduce casting defects.
[0014]
DETAILED DESCRIPTION OF THE INVENTION
DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, an X-ray tube container, a method for manufacturing the same, and an X-ray tube apparatus according to an embodiment of the present invention will be described with reference to FIGS.
[0015]
1 is a cross-sectional view of an X-ray tube apparatus showing an embodiment, FIG. 2 is a cross-sectional view of a container body formed by die casting using two cores, FIG. 3 is a cross-sectional view of the container body, and FIG. Is a side view of the container body, and FIG. 5 is a plan view of the container body.
[0016]
3 to 5, reference numeral 11 denotes a container main body of a storage container for accommodating an X-ray tube. The container main body 11 is made of metal and formed into a cylindrical shape by die casting, and has openings 12 and 13 at both ends in the axial direction. Is formed. A cathode mounting tube portion 14 and an anode mounting tube portion 15 are formed near both ends of the outer peripheral surface of the container body 11.
[0017]
Two tapered surfaces 16 and 17 are formed on the inner surface of the container body 11 so as to increase in diameter toward both ends in the axial direction. Corresponding to these tapered surfaces 16 and 17, the thickness of the container body 11 is formed so that both ends are thin. The taper angles θ1 and θ2 with respect to the axial direction of the taper surfaces 16 and 17 are greater than 0 degree and 3 degrees or less, more preferably greater than 0 degree and 1 degree or less in order to minimize the change in the thickness of the container body 11 as much as possible. Is set to about 0.5 degrees, for example.
[0018]
As will be described later, the position of the joint 18 between the two tapered surfaces 16 and 17 is an X-ray tube accommodated in the container body 11, and a high voltage socket or stator accommodated in the container body 11 together with the X-ray tube. It is preferable that the rotating magnetic field supply mechanism or the like be close to a component that is grounded. Thereby, the plus voltage and minus voltage of the X-ray tube can be separated.
[0019]
A plurality of component mounting portions 19 for mounting components housed in the storage container are formed to project at the joint 18 of the two tapered surfaces 16 and 17. Each component attachment portion 19 is formed with an attachment hole 20 penetrating in the axial direction of the container body 11.
[0020]
A plurality of thick portions (beat portions) 21 are formed in a ring shape along the circumferential direction on the outer peripheral surface of the container body 11, and a plurality of thick portions are formed in a block shape along the axial direction. A (beat portion) 22 is formed, and a window portion 23 that emits X-rays is further formed.
[0021]
Note that, on the outer peripheral surface of the container main body 11, a not-shown pouring gate removing portion remaining after the die casting cast gate has been removed is formed.
[0022]
A method for manufacturing the container body 11 by die casting will be described.
[0023]
For manufacturing the container body 11, a mold (not shown) for molding the outer surface of the container body 11, and the cores 31 and 32 shown in FIG. 2 for molding the inner surface of the container body 11 are used.
[0024]
The cores 31 and 32 are divided into two in the axial direction of the container body 11, and in order to allow the molds to be released in both end directions of the container body 11, taper angles that increase in diameter in the respective mold release directions A1 and A2. θ1 and θ2 are set. The taper angles θ1 and θ2 with respect to the axial direction of the cores 31 and 32 are set to be greater than 0 degree and 3 degrees or less, more preferably greater than 0 degree and 1 degree or less, for example, about 0.5 degrees. On the other hand, the core 32 is formed with a plurality of component attachment portion forming portions 33 for forming a plurality of component attachment portions 19 on end faces corresponding to the seams 18. Each component attachment portion forming portion 33 is formed in a concave shape, and a shaft 34 for forming the attachment hole 20 is projected from the concave portion.
[0025]
Then, the cores 31, 32, etc. are inserted into the mold and the mold is closed, and molten metal is injected from the mold gate by applying a predetermined high pressure.
[0026]
At this time, in order to inject molten metal from the pouring gate located corresponding to the outer peripheral surface of the container body 11, compared with the case where the pouring gate is located corresponding to the end of the container body 11 in the axial direction, The filling distance can be shortened, and casting defects in which cavities and the like are not sufficiently filled with molten metal can be reduced.
[0027]
After solidification of the molten metal, the mold is opened and the molded container body 11 is taken out from the mold. The cores 31 and 32 are punched in the corresponding punching directions A1 and A2.
[0028]
In this way, in the X-ray tube storage container for storing the X-ray tube, by forming the container body 11 by die casting, the packing density is high, the desired strength can be obtained, and the thickness can be reduced, and the manufacture is easy. In addition, mass production is possible and casting defects can be reduced.
[0029]
Furthermore, since the inner surface of the container body 11 is formed using the two cores 31 and 32 divided into two in the axial direction of the container body 11, as compared with the case where it is formed with one core as in the prior art, The difference in inner diameter of the container main body 11 can be reduced, and it is not necessary to perform processing for expanding the diameter after molding, and the manufacturing can be facilitated.
[0030]
In addition, the X-ray tube mounting portion 19 can be formed to protrude from the inner surface of the container body 11 at the joint of the two cores 31 and 32, and the X-ray tube accommodated in the container body 11 can be positioned and attached accurately.
[0031]
In addition, the taper angles θ1 and θ2 of the tapered surfaces for die cutting of the two cores 31 and 32 are set to be larger than 0 degree and 3 degrees or less, more preferably larger than 0 degree and 1 degree or less. The inner diameter difference of 11 can be reduced.
[0032]
In the case of die casting, cracks and the like are likely to occur in the container main body 11 due to metal shrinkage, but the influence of metal shrinkage can be prevented by forming the ring-shaped and block-like thick portions 21 and 22.
[0033]
Next, referring to FIG. 1, the configuration of an X-ray tube apparatus using a container 41 having the container body 11 will be described.
[0034]
The container 41 has a container main body 11, and a lead lining 42 made of, for example, lead for shielding X-rays is attached to the inner surface of the container main body 11, and an empty tray 43 is provided at the opening 12 at one end of the container main body 11. The cover 44 is fixed in the closed state via the cover, and the cover 45 is fixed in the closed state in the opening 13 at the other end.
[0035]
An X-ray irradiation window 46 is formed in the window 23 of the container body 11, and a window plate 47 that allows X-rays to pass through is attached to the X-ray irradiation window 46 in a closed state. An opening is also formed in the lining 42 corresponding to the X-ray irradiation window 46.
[0036]
In the container main body 11, an X-ray tube 48, a stator 49, and the like as parts to be accommodated in the accommodating container 41 are accommodated.
[0037]
The X-ray tube 48 includes a cathode portion 50 having a cathode for emitting an electron beam, and an anode portion 51 having a cathode that generates X-rays by collision of an electron beam emitted from the cathode. The anode part 51 is elongated in the axial direction, and an anode terminal part 52 is disposed at the end thereof.
[0038]
Around the cathode portion 50 of the X-ray tube 48, a holding body 53 made of, for example, a soft material for holding the X-ray tube 48 against the container body 11 is disposed. The holding body 53 is held in shape by a ring 54 formed of, for example, a hard material. An insulating holder 55 is disposed around the anode portion 51 of the X-ray tube 48 so as to cover the periphery of the anode portion 51. An end portion of the insulating holder 55 is provided with a terminal portion 55a attached to the anode terminal portion 52 and electrically connected thereto.
[0039]
The stator 49 includes a stator core 56 and a stator coil 57, and is disposed around the anode portion 51 of the X-ray tube 48 via an insulating holder 55. A plurality of stator support arms 58 are attached to the stator core 56, and the tips of the stator support arms 58 are attached to the component attachment portions 19 of the container body 11 by screws 59.
[0040]
A cathode bushing (insulating cylindrical body) 60 is inserted into the cathode mounting tube portion 14 of the container body 11 and fixed in a closed state. A cathode lead terminal 61 is disposed at the tip of the cathode bushing 60, and a lead wire 62 led out from the cathode portion 50 of the X-ray tube 48 is connected to the cathode lead terminal 61.
[0041]
An anode bushing (insulating cylindrical body) 63 is inserted into the anode mounting tube portion 15 of the container body 11 and fixed in a closed state. An anode lead terminal 64 is disposed at the tip of the anode bushing 63, and a lead wire 65 connected to the anode terminal portion 52 of the anode portion 51 of the X-ray tube 48 through the insulating holder 55 is connected to the cathode lead terminal 64. Yes.
[0042]
According to the X-ray tube apparatus configured as described above, by using the container body 11, it is easy to manufacture and mass production is possible, the manufacturing cost can be reduced, and the product accuracy can be improved.
[0043]
In addition, even if a vacuum die casting method, a hot chamber die casting method, a cold chamber die casting method, a squeeze casting method, or the like is adopted as the die casting method, the same effects as those of the above-described embodiment can be obtained.
[0044]
【The invention's effect】
According to the present invention, since the container main body is formed by die casting in the X-ray tube storage container for storing the X-ray tube, the packing density is large, the desired strength can be obtained, and the thickness can be reduced, and the manufacture is easy. In addition, mass production is possible and casting defects can be reduced.
[0045]
Furthermore, since the inner surface of the container main body is formed using two cores divided in two in the axial direction of the container main body, the inner diameter difference of the container main body can be reduced as compared with the case of forming with one core, It is not necessary to carry out processing for expanding the diameter after formation, and manufacturing can be facilitated. In addition, at the joint of the two cores, the component mounting portion can be formed to protrude from the inner surface of the container body, and the components accommodated in the container body can be positioned and attached accurately. Moreover, by largely 3 degrees or below the 0 degree taper angle for a die cutting of the two cores can be less the difference in inner diameter of the container body.
[0046]
Furthermore, in order to inject molten metal from the spout located corresponding to the outer peripheral surface of the container body, the filling distance from the sprue is greater than when the spout is positioned corresponding to the axial end of the container body. It can be shortened and casting defects can be reduced.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view of an X-ray tube apparatus showing an embodiment of the present invention.
FIG. 2 is a cross-sectional view of a container body formed by die casting using two cores as described above.
FIG. 3 is a sectional view of the container body.
FIG. 4 is a side view of the same container body.
FIG. 5 is a plan view of the container body.
FIG. 6 is a cross-sectional view of a container main body formed by gravity casting using a single core, showing a conventional X-ray tube container and a method of manufacturing the same.
[Explanation of symbols]
11 Container body
16, 17 Taper surface
19 Parts mounting part
31, 32 core
48 X-ray tubes as parts

Claims (7)

In an X-ray tube container that houses an X-ray tube,
It has a container body formed into a cylindrical shape by die casting,
On the outer peripheral surface of the container body, a gate removal portion from which the die casting casting gate has been removed is formed,
A container for an X-ray tube, characterized in that two tapered surfaces each having a diameter increasing toward both ends in the axial direction are formed on the inner surface of the container body . 2. The X-ray according to claim 1 , wherein a part mounting portion for mounting a part accommodated in the container corresponding to the joint of the two tapered surfaces is formed on the inner surface of the container main body so as to protrude. Tube container. 3. The container for an X-ray tube according to claim 1 , wherein a taper angle of the taper surface is greater than 0 degree and 3 degrees or less . In the manufacturing method of the X-ray tube storage container for storing the X-ray tube,
When forming the metal container body of the container by die casting,
Injecting molten metal from the spout located corresponding to the outer peripheral surface of the container body,
Using a pair of cores that are divided into two in the axial direction of the container main body and die-cut in both end directions of the container main body, two tapered surfaces that expand in diameter toward both ends in the axial direction are formed on the inner surface of the container main body. Form
A method of manufacturing an X-ray tube container characterized by the above. At the joint of the two cores, a component mounting portion is formed that is capable of mounting a component that protrudes from the inner surface of the container body and is accommodated in the container.
The method for producing an X-ray tube container according to claim 4. A core whose taper angle for die cutting is larger than 0 degree and not larger than 3 degrees is used.
The method for producing an X-ray tube container according to claim 4 or 5. An X-ray tube container according to any one of claims 1 to 3,
An X-ray tube accommodated in the container;
An X-ray tube apparatus comprising:

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