Search

KR-102963781-B1 - ROTATING ANODE TARGET OF X-RAY TUBE AND METHOD FOR MANUFACTURING THE SAME

KR102963781B1KR 102963781 B1KR102963781 B1KR 102963781B1KR-102963781-B1

Abstract

The present invention relates to a rotating anode target for an X-ray tube and a method for manufacturing the same, which is improved to drastically reduce the manufacturing time of the rotating anode target. The present invention provides a rotating anode target for an X-ray tube comprising a disc-shaped body and a track formed by lamination on the upper edge portion of the disc-shaped body, wherein the track is formed by lamination of powder or wire of a predetermined metal.

Inventors

  • 채영훈

Assignees

  • 경북대학교 산학협력단

Dates

Publication Date
20260511
Application Date
20231116

Claims (13)

  1. A rotating anode target of an X-ray tube comprising a disc-shaped body and a track formed by stacking on the upper edge portion of the disc-shaped body, The above track is formed by sprinkling and welding powder or wire of a predetermined metal to form a laminated structure, and The above track is formed by welding the metal powder or wire using the Directed Energy Deposition (DED) method metal 3D printing, and The metal 3D printed track using the above DED method is, base layer and; An intermediate layer formed on the upper part of the above base layer; and It includes a surface layer formed on the upper part of the above intermediate layer, and The above intermediate layer is formed with a higher coefficient of thermal expansion than the base layer, and The above surface layer is formed with a higher density compared to the base layer and the intermediate layer, and The above base layer is characterized by having a honeycomb structure, a rotating anode target of an X-ray tube.
  2. delete
  3. delete
  4. delete
  5. In paragraph 1, A rotating anode target of an X-ray tube characterized by the above base layer being formed with a thickness of 0.2 mm.
  6. In paragraph 1, The above base layer is made of molybdenum (Mo), and The time required to process the above disc-shaped body is 1 hour, and A rotating anode target of an X-ray tube characterized by the fact that the time required to form the above track is 3 hours.
  7. A method for manufacturing a rotating anode target for an X-ray tube comprising a disc-shaped body and a track formed by stacking on the upper edge portion of the disc-shaped body, (a) a step of manufacturing the above-mentioned disc-shaped body by processing it; (b) a step of forming a track by spraying powder or wire of a predetermined metal into a circular track groove of a predetermined depth formed on the upper surface of the disc-shaped body and welding it. In step (b) above, the track is formed by welding metal powder or wire using Directed Energy Deposition (DED) metal 3D printing, and The metal 3D printed track using the above DED method is, (b-1) A step of forming a base layer; (b-2) A step of forming an intermediate layer on top of the base layer; (b-3) A step of forming a surface layer on top of the intermediate layer, and The above intermediate layer is formed with a higher coefficient of thermal expansion than the base layer, and The above surface layer is formed with a higher density compared to the base layer and the intermediate layer, and The processing time for machining the above-mentioned disc-shaped body is 1 hour, and The process time for forming the above track takes 3 hours, and A method for manufacturing a rotating anode target for an X-ray tube, characterized in that the above base layer is formed in a honeycomb structure.
  8. delete
  9. delete
  10. delete
  11. In Paragraph 7, A method for manufacturing a rotating anode target for an X-ray tube, characterized in that the above base layer is formed to a thickness of 0.2 mm.
  12. In Paragraph 7, A method for manufacturing a rotating anode target for an X-ray tube, characterized in that the base layer is made of molybdenum (Mo).
  13. delete

Description

Rotating Anode Target of X-ray Tube and Method for Manufacturing the Same The present invention relates to a rotating anode target for an X-ray tube and a method for manufacturing the same, and more specifically, to a rotating anode target for an X-ray tube and a method for manufacturing the same that is improved to drastically reduce the manufacturing time of the rotating anode target. When electrons emitted from the cathode are accelerated by the action of electromagnetic force and collide with a target at the anode, X-rays are emitted from the target surface due to the collision energy; these X-rays have exceptional penetrating power and are applied in various fields, such as medical imaging devices and industrial imaging equipment. The X-ray tube manufactured to emit such X-rays has an anode and a cathode inside a vacuum tube, and operates by inducing a potential difference between the anode and cathode, causing electrons to be accelerated by this potential difference and collide with a target. And when a high voltage of tens of thousands of volts or more is applied to an anode made of tungsten or molybdenum, electrons collide with the anode and emit the energy they possess as X-rays. More than 99% of the energy generated by the aforementioned electron collision is converted into heat, and the remainder is converted into X-rays. As such, since most of the energy is converted into heat, high heat is inevitably generated at the target area, i.e., the anode, and since the amount of heat generated is proportional to the power applied to the X-ray tube, the power input to the X-ray tube must be limited. This is because while higher X-ray energy can be obtained by increasing the input power, the stability of the X-ray tube itself cannot be guaranteed. An anode-rotating X-ray tube, manufactured to allow the anode where electrons collide to rotate, is designed to increase X-ray emission under limited power conditions and is equipped with a rotating anode target. There are various types of such bipolar rotating X-ray tubes, and Figure 1 shows a configuration diagram to explain the basic concept of a bipolar rotating X-ray tube. Referring to FIG. 1, the anode rotary X-ray tube (10) is configured to include a transparent vacuum tube (12) in which a vacuum is maintained, a cathode focusing tube module (14) installed inside the vacuum tube (12), and a driving unit (18) that rotates a rotary anode target (20). Additionally, the rotating anode target (20) includes a disc-shaped body (22) fixed to the drive shaft (16) of the drive unit (18), and a track (24) stacked on the upper edge of the disc-shaped body (22). And the internal space (12a) of the vacuum tube (12) is maintained at a high vacuum through at least one vacuum operation to maintain an optimal environment for generating X-rays. Additionally, the above-mentioned cathode focusing tube module (14), although not shown in the drawing, is equipped with a cathode focusing tube, an electrode stem, a stem fixing body, an insulating tube, etc., and has an electron beam emitting part (14a) at a point facing the track (24) of the above-mentioned rotating anode target (20). The electron beam emitting unit (14a) emits electrons while forming a potential difference of approximately 150 volts between itself and the rotating anode target (20), and the emitted electron beam is accelerated toward the rotating anode target (20) and collides with the track (24), and the track (24) emits X-rays upon colliding with the electron beam. However, the above track (24) was heated to a very high temperature by concentrated collision with the electron beam, and consequently, there were problems such as easy deterioration and shortened lifespan. In addition, the conventional method of laminating tracks (24) involved spraying tungsten in a vacuum environment, but this required expensive equipment and had limitations in forming durable laminated tracks. Next, to explain the method for manufacturing the above-mentioned rotating anode target (20), as shown in FIG. 2, first, a powder for track molding is mixed (Step 31). Next, the track molding powder is filled into the track groove, the core mold is lowered, and the body molding powder is injected to form a rotating anode target (20). (Step 33) Then, the mold is removed and the separated molded product is heated and sintered. (Step 35) However, in the method of manufacturing a rotating anode target (20) to which the above-mentioned conventional high-temperature sintering molding technology is applied, the process of mixing the powder for track molding in step 31 takes approximately 8 hours (hr), the molding process of molding using the mixed powder in step 33 takes approximately 1 hour, and the process of sintering in step 35 takes approximately 23 hours. As such, the conventional method for manufacturing a rotating anode target (20) had the problem that too much time was required to manufacture the rotating anode target (20). Accordingly, th