Contact-type position measuring device and measuring method using the same

{
  "publication_number": "US10422620B2",
  "country": "US",
  "kind": "B2",
  "title": "Contact-type position measuring device and measuring method using the same",
  "abstract": "A contact-type position measuring device is configured by a straight hole diameter measuring probe measuring a diameter of straight hole by moving in a radius direction and contacting to an internal peripheral surface of a straight hole, which extends to an axis direction; and a chamfered hole diameter measuring probe measuring a diameter of chamfered hole by moving in the axis direction and contacting to an internal peripheral surface of a chamfered hole.",
  "claims": [
    "1. A measuring method of a chamfered hole diameter using a contact-type position measuring device, the method comprising the steps of: measuring a diameter of a straight hole by moving a straight hole diameter measuring probe in a radius direction along an X-axis direction, by contacting to an internal peripheral surface of the straight hole which extends in an axis direction perpendicular to the X-axis direction, by computing a center of the straight hole by the measured diameter of the straight hole, and by moving the straight hole diameter measuring probe in the radius direction along a Y-axis direction perpendicular to the axis direction and the X-axis direction in a manner of going through the center of the movement amount in the X-axis direction; moving a chamfered hole diameter measuring probe to be aligned with the computed center of the straight hole; measuring the chamfered hole diameter by moving the chamfered hole diameter measuring probe in the axis direction and by contacting to an internal peripheral surface of the chamfered hole so as to measure a stroke amount; and computing the diameter of the chamfered hole based on the measured stroke amount."
  ],
  "description_excerpt": "The present invention relates to a contact-type position measuring device, which is used when, for example, a chamfering process is performed by a machine tool, and a measuring method using the same.\n\nIn a case that a straight hole is formed in a workpiece by a machine tool, there is a case in which a chamfering process is performed to an opening rim part of the straight hole. As a measuring device in order to measure a diameter of a chamfered hole formed by such chamfering process, for example, Japanese Utility Model Patent Application No. H03-23303 discloses a device that measures the diameter of the chamfered hole by contacting an approximately conical-shaped measuring probe to the chamfered part.\n\nIn the case that the chamfering process was performed to the opening rim part of the straight hole, in addition to the measurement of the diameter of the chamfered hole, there was a case in which it was also required to measure the diameter of the straight hole. In such case, first, the diameter of the straight hole was measured by the straight hole diameter measuring probe, and after replacing the straight hole diameter measuring probe with the chamfered hole diameter measuring probe such as the conventional measuring device, the diameter of the chamfered hole was measured. Therefore, the problems were that the measuring work was required much more effort, and the working time took longer.\n\nFurther, when the diameter of the chamfered hole was measured by the conventional measuring device, it was required that the axis of the measuring probe was accurately aligned with the hole center of the chamfered hole.",
  "cpc": [
    "G01B 5/12",
    "B23Q 17/20",
    "G01B 5/012",
    "G01B 5/243"
  ],
  "ipc": [
    "B23Q 17/20",
    "G01B 5/12"
  ],
  "assignees": [
    "DMG Mori Co Ltd"
  ],
  "inventors": [
    "Koji Sato"
  ],
  "filing_date": "2015-12-01",
  "publication_date": "2019-09-24",
  "grant_date": "2019-09-24",
  "priority_date": "2014-12-15",
  "application_number": "US-201515535799-A",
  "family_id": "56102993",
  "cited_by_count": 9,
  "citations": [
    "JPS6051407U",
    "JPS6069501A",
    "US4905378A",
    "US4753555A",
    "JPH0323303U",
    "US5259119A",
    "JPH09242347A",
    "US8908901B2",
    "EP2009388A1",
    "US8464434B1",
    "WO2013108875A1",
    "EP2808642A1",
    "US20150040414A1",
    "US20150369581A1",
    "DE102012025252A1",
    "US20180149457A1",
    "US20180023945A1"
  ]
}