KR102015640B1 - Mold apparatus for manufacturing rotating anode target for positive-polarity X-ray tube and Method for manufacturing rotating anode target using the same - Google Patents

Abstract

The present invention relates to a mold apparatus for manufacturing a rotating anode target for a positive-polarity x-ray tube and a method for manufacturing a rotating anode target using the same. The mold apparatus is configured to manufacture a rotating anode target including a disk-type body and a ring-shaped track formed on an upper outer edge of the body to emit X-rays by collision with electron beams irradiated towards a surface of the body. The mold apparatus comprises: a lower punch including a ring mold which is mounted in a cylinder-type casing, a core mold which is inserted into the ring mold and disposed separately from an inner circumferential surface of the ring mold, and a punching ring which is capable of moving up and down while being interposed between the ring mold and the core mold and forms a support surface without a stepped portion with upper surfaces of the ring mold and the core mold while being moved upward and forms a filling groove having a predetermined depth between the ring mold and the core mold while being moved downward; and a support disk as a disk-type member, supporting the casing, the ring mold and the core mold while being supported on a horizontal support surface, and causing the punching ring to be maintained in a descended state. Accordingly, the mold apparatus for manufacturing a rotating anode target for a positive-polarity x-ray tube of the present invention has a simple structure, can be manufactured by a simple manufacturing method and is configured to perform strong bonding through inter-particle coupling of the track to the body, thereby manufacturing the rotating anode target with excellent durability.

Description

Mold apparatus for manufacturing a rotating anode target for an anode rotating X-ray tube and a method for manufacturing a rotating anode target using the same {Mold apparatus for manufacturing rotating anode target for positive-polarity X-ray tube and Method for manufacturing rotating anode target using the same}

The present invention relates to the manufacture of a rotating anode target mounted on the anode rotating X-ray tube, and more particularly, to a mold apparatus for manufacturing a rotating anode target for an anode rotating X-ray tube and a method of manufacturing a rotating anode target using the same.

When electrons emitted from the cathode are accelerated by the action of electromagnetic force and collide with the target of the anode, X-rays are emitted from the target surface by the collision energy. The X-rays have a unique transmittance and have been applied to fields such as medical imaging apparatuses and industrial imaging apparatuses.

An X-ray tube is a vacuum tube manufactured to output X-rays. The X-ray tube has an anode and a cathode therein, and induces a potential difference between the anode and the cathode, which induces electrons to be accelerated by the potential difference to collide with the target. It works. For example, when a high voltage of tens of thousands of volts is applied to an anode, electrons collide with an anode made of, for example, tungsten, molybdenum, or the like, and emit energy of its own as X-rays.

Meanwhile, more than 99% of the energy generated by the collision of electrons is converted into heat and the rest is converted into X-rays. As such, since most of the energy is converted into heat, high heat is generated at the target site, that is, the anode. Since the heat of the high heat is proportional to the power applied to the X-ray tube, it is bound to limit the power input to the X-ray tube. If the input power is increased, higher X-ray energy can be obtained, but the power is limited only for the stability of the X-ray tube itself.

A bipolar rotary x-ray tube is an x-ray tube to which the X-ray emission is applied under a limited power condition, and has a rotary rotary anode target serving as a target. There are various types of such bipolar rotatable X-ray tubes and have a structure of approximately FIG.

1 is a schematic view for explaining the basic concept of a bipolar X-ray tube.

As shown, the positive electrode X-ray tube 10, the vacuum tube 12, the vacuum tube 12, the negative electrode focusing tube module 14, the rotating anode target 20, the rotating anode is installed on the vacuum tube 12 And a driver 18 for rotating the target 20. In addition, the rotary anode target 20 includes a disk-shaped body 22 fixed to the drive shaft 16 of the driving unit 18, and a stacked track 24 stacked on the upper edge of the body 22. .

The inner space 12a of the vacuum tube 12 maintains high vacuum through, for example, first and second vacuum operations in order to optimally maintain an environment for generating X-rays. In addition, the cathode tube focusing module 14 includes a cathode focusing tube (not shown), an electrode stem, a stem fixing body, an insulating tube, and the like, and an electron beam emitting portion at a point facing the stacking track 24 of the rotating anode target 20. (14a).

The electron beam emitter 14a forms an electric potential difference of about 150 volts between the rotating anode target 20 and emits electrons. The electron beam emitted from the electron beam emitting unit 14a is accelerated toward the rotating anode target 20 by the potential difference and collides with the stacked track 24. The stacked track 24 emits X-rays by collision with the electron beam.

However, the stacked track 24 is heated to a very high temperature by intensive collision with the electron beam, thereby easily deteriorating and shortening the lifespan. As a conventional method of stacking stacked tracks, there has been a method of thermally spraying tungsten in a vacuum environment, but this requires expensive equipment and has a limit in forming durable stacked tracks.

Domestic Patent Publication No. 10-0385639 (Rotating Bipolar X-ray Tube) Registered Korean Patent Publication No. 10-1080713 (molybdenum alloy X-ray target with uniform particle structure)

The present invention has been created to solve the above problems, the structure and the manufacturing method is simple, and since the strong coupling through the interparticle bonding of the track to the body to implement a rotating rotating anode target that is superior in durability so that it can be manufactured An object of the present invention is to provide a mold apparatus for manufacturing a conventional rotary anode target and a method of manufacturing a rotary anode target using the same.

In order to achieve the above object, a mold apparatus for manufacturing a rotating anode target for an anodic rotary X-ray tube according to the present invention includes a disk-shaped body, an electron beam positioned at an outer periphery of the upper body, and shaped into a ring and irradiated toward the surface thereof. Claims [1] A method for manufacturing a rotating anode target having a track for emitting X-rays due to a collision, comprising: a cylindrical casing having a molding space having a predetermined inner diameter; A ring mold which supports and supports the molding target powder introduced into the molding space while being mounted in the casing. The ring mold adheres to the inner circumferential surface of the casing and provides an upper and lower receiving space, the ring mold being inserted into the receiving space of the ring mold. The core mold disposed to be spaced apart from the inner circumferential surface of the mold, the ring mold and the ring mold and the core mold can be lifted and raised in a raised state to form a support surface without step with the upper surface of the ring mold and the core mold, and the ring is lowered. A lower punch having a punching ring for providing a filling groove having a predetermined depth between the mold and the core mold; A disc-shaped member, wherein the support ring supports the casing, the ring mold and the core mold in a state of being supported on a horizontal support surface, and the punching ring includes a support disc to maintain the lowered state.

In addition, as the lower punch, the upper punch further enters into the molding space of the casing and presses the powder to be molded.

In addition, the lower end of the punching ring is provided with a protrusion protruding downward corresponding to the depth of the filling groove with respect to the lower end of the ring mold and the core mold in the falling state of the punching ring.

In addition, the supporting disk is provided with a plurality of guide holes through which the protrusion of the punching ring passes downward so that the protrusion contacts the support surface.

In addition, a horizontal flat portion is formed at the center of the upper surface of the core mold, and an inclined surface portion inclined upward in the radial direction is formed around the flat portion, and the inclined surface portion of the core mold is formed on the upper surface of the ring mold and the punching ring. An upper sloped surface having the same inclination angle is formed.

In addition, the rotating anode target manufacturing method of the present invention for achieving the above object, X-rays by collision with the disk-shaped body, and the electron beam irradiated toward the surface of the upper surface of the body in the form of a ring A method for manufacturing a rotating anode target having a track for emitting a light, comprising: a cylindrical casing providing a molding space having a predetermined inner diameter, a ring mold having a receiving space in close contact with an inner circumferential surface of the casing, and open vertically; A core mold inserted into a receiving space of the ring mold and spaced apart from an inner circumferential surface of the ring mold, and a ring-shaped member that can be elevated in an interposed state between the ring mold and the core mold. A punching ring for forming a support surface that is not provided and forming a filling groove having a predetermined depth between the ring mold and the core mold in a descending state; A mold setting step of preparing a mold having a support disk which will maintain a state in which the punch is moved down to the ring unit; A track molding powder filling step of filling a track molding powder to form the track in the filling groove; A target body powder input step of injecting a target body powder for forming the body into the casing after the filling of the track molding powder is completed; Pressing the powder contained in the casing with the support disk removed, the punching ring is lifted by the reaction force and lifts the track molding powder inside the filling space to penetrate into the target body powder. Steps; And a mold removing step of removing the mold after the pressing process of the powder is completed.

In addition, the method further includes a sintering step of heating and sintering a molding separated from the mold through the mold removing step.

The mold apparatus for manufacturing a rotating anode target for an anodic rotating X-ray tube made of the present invention as described above is simple in structure and manufacturing method, and implements a strong coupling through interparticle bonding of a track to a body, thus having a durable rotating anode target. Can be produced.

1 is a schematic view for explaining the basic concept of a bipolar X-ray tube.
2 is an exploded perspective view of a mold apparatus for manufacturing a rotating anode target for an anodic rotation type X-ray tube according to an embodiment of the present invention.
3 is a side cross-sectional view of the mold apparatus shown in FIG.
4A to 4E are diagrams schematically showing a method of manufacturing a rotating anode target using the mold apparatus.
5 is a block diagram illustrating a method of manufacturing a rotating anode target according to an embodiment of the present invention.

Hereinafter, one embodiment according to the present invention will be described in detail with reference to the accompanying drawings.

Basically, the mold apparatus 30 for manufacturing a rotating anode target for an anodic rotation type X-ray tube according to the present embodiment is for manufacturing the rotating anode target 80 shown in Fig. 4E, and in particular, before sintering, the body 80a By inducing the particle-to-particle coupling between the track and the track 80b, the coupling of the track 80b to the body 80a can be realized very strongly. In addition, the track 80b in the rotating anode target 80 manufactured by the mold apparatus 30 has a good mechanical strength of its own, so that its life is long.

2 is an exploded perspective view of a mold apparatus 30 for manufacturing a rotating anode target for an anodic rotation type X-ray tube according to an embodiment of the present invention, and FIG. 3 is a side cross-sectional view of the mold apparatus illustrated in FIG.

As shown in the drawing, the mold apparatus 30 for manufacturing a rotating anode target according to the present embodiment is arranged in a cylindrical casing 40 having a molding space 40a having a predetermined inner diameter, and inside a molding space of the casing 40. It is provided with a support disk 70 for supporting the upper punch 50 and the lower punch 60, the casing 40 and the lower punch (60).

The mold apparatus 30 having the above-described configuration is located in the disk-shaped body (80a in FIG. 4E) and the upper edge of the upper surface of the body 80a, shown in FIG. 4E, and takes the form of a ring and irradiates toward the surface thereof. It is used to manufacture a rotating anode target 80 having a track 80b that emits X-rays by collision with an electron beam, which is supported on a horizontal support plane 90. The support plane 90 may be a working die of a hydraulic press.

First, the casing 40 is a cylindrical member having a predetermined inner diameter and an outer diameter that is opened up and down, and accommodates powder to be press molded therein. The powder in this embodiment includes a track molding powder (A) and a target body powder (B).

The track molding powder (A) may be a TZM alloy powder in which titanium, zirconium, and molybdenum powder are mixed, or W-Re in which tungsten and rhenium are mixed. The track molding powder A is transformed into the track 80b through pressing and sintering. In addition, the target body powder (B) is made of a disk-shaped body (80a) through the pressing and sintering process as molybdenum powder.

The casing 40 is set vertically on the support plane 90 while being supported by the support disk 70. As will be described later, in the situation in which the support disk 70 is removed, as shown in FIG. 4D, the support disk 90 stands directly on the support plane 90.

The upper punch 50 is a cylindrical member having a predetermined diameter, and moves up and down in a state mounted on a separate hydraulic press (not shown). The upper punch 50 is lowered or raised while being inserted into the molding space 40a of the casing 40. As the upper punch 50 descends, the track molding powder A and the target body powder B, which are pre-injected into the molding space 40a, are pressed at a very strong pressure and form particles.

The lower punch 60 includes a ring mold 61, a punching ring 63, and a core mold 65. The ring mold 61, the punching ring 63, and the core mold 65 constitute one lower punch 60 in a state in which they are coupled to each other, and as shown in FIG. 3, the lower portion of the molding space 40a is formed. In the fitted state, it supports the molding target powder introduced into the molding space. The upper surface of the lower punch 60 is a support surface 60a for supporting the powder.

The ring mold 61 is a ring-shaped member having a predetermined inner diameter and an outer diameter, and provides a receiving space 61a therein. The accommodation space 61a is a groove that accommodates the punching ring 63 and the core mold 65.

The outer circumferential surface of the ring mold 61 is in close contact with the inner circumferential surface of the casing 40. Coupling and separation of the ring mold 61 to the casing 40, as well as position adjustment is possible. In addition, an upper sloped surface 61b is provided at an upper end of the ring mold 61. The upper sloped surface 61b is an inclined surface inclined downward from the outer circumferential surface of the ring mold 61 toward the inner circumferential surface. The inclination angle of the upper sloped surface 61b is the same as the inclination angle of the inclined surface portion 65b of the core mold 65 to be described later.

The core mold 65 is a member disposed in the center of the receiving space 61a of the ring mold 61, and the outer peripheral surface portion 65c is spaced apart from the inner peripheral surface 61c of the ring mold by a predetermined interval. In addition, the upper surface of the core mold 65 is provided with a flat portion 65a and an inclined surface portion 65b. The planar portion 65a is a circular portion formed in the center portion of the upper surface of the core mold 65. Incidentally, the inclined surface portion 65b is a portion inclined upward in the radial direction from the planar portion 65a. As mentioned above, the inclination angle of the planar portion 65a is equal to the inclination angle of the top inclined surface 61b of the ring mold 61.

On the other hand, the punching ring 63 is a ring-shaped member which can be elevated in a state interposed between the ring mold 61 and the core mold 65. The outer circumferential surface and the inner circumferential surface of the punching ring 63 are slidable in a state of being in contact with the inner circumferential surface 61c of the ring mold 61 and the outer circumferential surface portion 65c of the core mold 65. That is, the punching ring 63 is capable of lifting and lowering in a state sandwiched between the ring mold 61 and the core mold 65.

In addition, a protrusion 63d is formed at the lower end of the punching ring 63. The protruding portion 63d passes downward through the guide hole 70a of the support disk 70 and is separated by the groove portion 63c as a lower end portion thereof in contact with the upper surface of the support plane 90. The protrusion 63d is symmetrical about the center of the punching ring 63.

In addition, the pressing surface 63b is provided at the upper end of the punching ring 63. The pressing surface 63b is a portion inclined downward from the outer circumferential surface of the punching ring 63 toward the inner circumferential surface and has the same inclination angle as the upper sloped surface 61b.

In particular, as shown in FIG. 4D, the punching ring 63 is raised between the ring mold 61 and the core mold 65, and has a step with the top inclined surface 61b and the inclined surface portion 65b. The non-supporting surface 60a is formed, and a filling groove 62 having a predetermined depth is provided between the ring mold 61 and the core mold 65 in a state of being lowered as shown in FIG. 4A.

The support disk 70 is a disk-shaped member having a predetermined thickness, and a plurality of guides as a member supporting the casing 40, the ring mold 61, and the core mold 65 in a state of being supported on the support plane 90. It has a hole 70a.

The guide hole 70a is a hole through which the projecting portion 63d of the punching ring 63 in a lowered state passes. As mentioned above, the projection 63d is supported on the support plane 90 while passing through the guide hole 70a. The protruding portion 63d is always in contact with the support plane 90 regardless of the state in which the support disk 70 is installed.

In addition, the thickness of the support disk 70 is equal to the height H of the step 63d of the protrusion 63d with respect to the groove 63c and the depth Z of the filling groove 62. Therefore, as shown in FIG. 4C, when the lower punch 60 is set down while the supporting disk 70 is removed, the punching ring 63 is relative to the ring mold 61 and the core mold 65. As it rises, the support surface 60a without a step is formed.

4A to 4E are diagrams schematically illustrating a method of manufacturing a rotating anode target using the mold apparatus, and FIG. 5 is a block diagram illustrating a method of manufacturing a rotating anode target according to an embodiment of the present invention.

As shown, the rotating anode target manufacturing method according to the embodiment, the mold setting step 101, the track molding powder filling step 103, the target body powder input step 105, the pressurizing and track molding powder penetration guide step 107, the mold removing step 109, and the sintering step 111.

First, in the mold setting step 101, the lower punch 60 and the support disk 70 are fitted to the casing 40 so that the mold apparatus 30 is placed on the support plane 90. It is a process.

In other words, as shown in FIG. 4A, the ring mold 61, the core mold 65, and the punching ring 63 are combined to be inserted into the casing 40, and the support disk is disposed below the casing 40. 70 is the process of positioning. At this time, the protruding portion 63d is in contact with the support plane 90 through the guide hole 70a, that is, the punching ring 63 is lowered to secure the filling groove 62.

The following track molding powder filling step 103 is a process of filling the track molding powder A inside the secured filling groove 62. Track molding powder is mentioned above.

In some cases, the track molding powder filling step 103 may be performed in advance. For example, the lower punch 60 structure and the support disk 70 are assembled to form the track molding powder in the filling groove 62 while securing the filling groove 62, and the lower punch 60 in this state. It may be inserted into the casing (40).

When the track molding powder A is filled in the filling groove 62, the target body powder input step 105 of filling the target body powder B into the molding space 40a is performed. At this time, the amount of the target body powder (B) is injected as necessary. As shown in FIG. 4B, the injected target body powder B is stacked on top of the lower punch 60, and a part thereof contacts the track molding powder A. As shown in FIG.

After the target body powder input step 105 is completed, the pressure and track molding powder penetration guide step 107 is performed. Pressurizing and track molding powder penetration guide step 107 is a process of pressing the upper punch 50 downward in the direction of arrow F of FIG. 4C with the support disk 70 removed.

When the upper punch 50 is pressed downward, the powders A and B contained in the casing 40 are compressed and the punching ring 63 is relatively reacted by the reaction force against the downward pressing force of the upper punch 50. To rise. Relatively rising means that the punching ring 63 rises relative to the ring mold 61 and the core mold 65. More precisely, the punching ring 63 maintains the state, and the ring mold 61 and the core mold 65 are lowered by the pressing force of the upper punch 50.

Through the above process, the track molding powder A filled in the filling groove 62 is subjected to a strong upward pressure by the punching ring 63, and rises in the direction of the arrow s of FIG. 4C, and the target body powder B Penetrate inside. The target body powder (B) and the track molding powder (A) are bonded to each other. Reference numeral C shown in FIG. 4D denotes a powder penetration site in which the track molding powder A penetrates and binds to the target body powder B. As shown in FIG.

When the combination of the track molding powder A and the target body powder B is completed through the pressurization and track molding powder penetration guide step 107, the mold removing step 109 is performed. The mold removing step 109 is a process of separating the molding from the mold after the pressing process for the powder is completed.

Subsequent sintering step 111, the molded product separated from the mold apparatus 30 through the mold removal step 109 is a process of heating and sintering. The sintering process itself can be followed by a general process. Through the sintering step 111 to obtain a rotary anode target 80 shown in Figure 4e.

As mentioned above, although this invention was demonstrated in detail through the specific Example, this invention is not limited to the said Example, A various deformation | transformation is possible for a person with ordinary knowledge within the scope of the technical idea of this invention.

10: bipolar rotary x-ray tube 12: vacuum tube 12a: inner space
14: cathode collecting tube module 14a: electron beam emitter 16: drive shaft
18: drive unit 20: rotary anode target 22: body
24: stacked track 30: molding apparatus 40: casing
40a: molding space 50: upper punch 60: lower punch
60a: ground 61: ring mold 61a: accommodation space
61b: Upper sloped surface 61c: Inner circumferential surface 62: Filling groove
63: punching ring 63b: pressurization surface 63c: groove
63d: protrusion 65: core mold 65a: flat portion
65b: sloped surface portion 65c: outer peripheral surface portion 70: support disk
70a: guide hole 80: rotary anode target 80a: body
80b: Track 90: Support Plane

Claims (7)

In order to manufacture a rotating anode target having a disk-shaped body and a track located on the upper edge of the body and taking the form of a ring and emitting X-rays by collision with an electron beam irradiated toward the surface.
A cylindrical casing having a forming space having a constant inner diameter;
A ring mold which supports and supports the molding target powder introduced into the molding space while being mounted in the casing. The ring mold adheres to the inner circumferential surface of the casing and provides an upper and lower receiving space, the ring mold being inserted into the receiving space of the ring mold. The core mold disposed to be spaced apart from the inner circumferential surface of the mold, the ring mold and the ring mold and the core mold can be lifted and raised in a raised state to form a support surface without step with the upper surface of the ring mold and the core mold, and the ring is lowered. A lower punch having a punching ring for providing a filling groove having a predetermined depth between the mold and the core mold;
A disc-shaped member, comprising: a support for supporting a casing, a ring mold and a core mold in a state of being supported on a horizontal support surface, and the punching ring including a support disk for maintaining a lowered state. Molding device for manufacturing. The method of claim 1,
Corresponding to the lower punch, a mold apparatus for manufacturing a rotating anode target for a positive electrode rotating X-ray tube further comprises an upper punch to enter the molding space of the casing and press the powder to be molded. The method of claim 2,
The lower end of the punching ring, a mold apparatus for producing a rotating anode target for a bipolar rotary X-ray tube having a protrusion protruding downward corresponding to the depth of the filling groove with respect to the lower end of the ring mold and the core mold in the falling state of the punching ring. . The method of claim 3,
The supporting disk, a mold apparatus for producing a rotating anode target for a bipolar rotary X-ray tube having a plurality of guide holes through which the projection of the punching ring passes downward to contact the support surface. The method of claim 2,
A horizontal flat portion is formed in the center of the upper surface of the core mold,
Around the flat portion is formed an inclined surface portion inclined upward in the radial direction,
Molding apparatus for manufacturing a rotating anode target for a bipolar rotary X-ray tube formed on the top surface of the ring mold and the punching ring has an inclined surface having the same inclination angle as the inclined surface portion of the core mold. A method for manufacturing a rotating anode target having a disk-shaped body and a track located at the outer periphery of the body and having a ring shape and emitting X-rays by collision with an electron beam irradiated toward the surface.
Cylindrical casing providing a molding space of a predetermined inner diameter, a ring mold having a receiving space in close contact with the inner circumferential surface of the casing, and a core mold inserted into the receiving space of the ring mold and spaced apart from the inner circumferential surface of the ring mold. And a ring-shaped member that can be elevated in a state interposed between the ring mold and the core mold, wherein the ring mold and the core mold are formed in a raised state so as to form a support surface without a step, and the ring mold and the core mold in a lowered state. A mold setting step of preparing a mold including a punching ring forming a filling groove having a predetermined depth therebetween, and a support disc at the lower portion of the casing to maintain the punching ring in a lowered state;
A track molding powder filling step of filling a track molding powder to form the track in the filling groove;
A target body powder input step of injecting a target body powder for forming the body into the casing after the filling of the track molding powder is completed;
Pressing the powder contained in the casing with the support disk removed, the punching ring is lifted by the reaction force and lifts the track molding powder inside the filling space to penetrate into the target body powder. Steps;
Rotating anode target manufacturing method comprising a mold removing step of removing the mold after the pressing process of the powder is completed. The method of claim 6,
And a sintering step of heating and sintering a molding separated from the mold through the mold removing step.

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