Patents by Inventor Jae Seung Cheon

Jae Seung Cheon has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Patent number: 6418795
    Abstract: A method of measuring shear friction factor between a workpiece material and a forming tool through a backward extrusion process. The method includes steps of: positioning the workpiece material at a groove previously manufactured on the forming die by turning; pressurizing the workpiece material to form an extruded product by pressure of a downwardly moving punch; forming tip on the extruded end of the extruded product; measuring an external diameter of the extruded product and a diameter of the tip, and obtaining a perpendicular distance by subtracting the diameter of the tip from the external diameter and dividing the subtracting result by two; and acquiring shear friction factor by calculating predetermined coefficients and a normalized perpendicular distance non-dimensionalized by thickness value of the extruded product. The thickness is defined as an interval between the external diameter of the extruded product and an external diameter of the punch.
    Type: Grant
    Filed: February 15, 2001
    Date of Patent: July 16, 2002
    Assignee: Korea Advanced Institute of Science and Technology
    Inventors: Yong Taek Im, Jae Seung Cheon, Soo Young Kim, Geun An Lee, Seong Hoon Kang
  • Publication number: 20010027686
    Abstract: A method of measuring the representative shear friction factor at the interface between a workpiece material and forming die during bulk forming processes through a backward extrusion process is disclosed. In this measuring method, the workpiece material is primarily positioned at a predetermined groove location within the forming die of the extrusion tool-set and is pressurized by a punch. This process forms an apex at the backward extruded end of the extruded product. Thereafter, the perpendicular distance “d” from the external side surface of the extruded product to the apex is measured and used to calculate the representative shear friction factor “mf”. In the above method, the diameter of the workpiece material is equal to the average of the outer diameter of the punch and the inner diameter of the forming die. It is also positioned such that its central axis is aligned with the central axes of both the punch and the forming die.
    Type: Application
    Filed: February 15, 2001
    Publication date: October 11, 2001
    Inventors: Yong Taek Im, Jae Seung Cheon, Soo Young Kim, Geun An Lee, Seong Hoon Kang