IPC분류정보
국가/구분 |
United States(US) Patent
등록
|
국제특허분류(IPC7판) |
|
출원번호 |
US-0982869
(2004-11-08)
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우선권정보 |
JP-2003-388957(2003-11-19); JP-2004-124178(2004-04-20) |
발명자
/ 주소 |
- Nakayama,Tatsuomi
- Ota,Minoru
- Wakuda,Manabu
- Takashima,Kazuhiko
|
출원인 / 주소 |
|
대리인 / 주소 |
|
인용정보 |
피인용 횟수 :
5 인용 특허 :
9 |
초록
▼
A micro-roll forming device for providing a cylindrical blank metal article with a minute convexoconcave bearing surface, comprises a powered article holding structure that, when energized, rotates the cylindrical blank metal article about its axis; a forming tool that includes a form roller with a
A micro-roll forming device for providing a cylindrical blank metal article with a minute convexoconcave bearing surface, comprises a powered article holding structure that, when energized, rotates the cylindrical blank metal article about its axis; a forming tool that includes a form roller with a corrugated circular ridge; a tool holding structure that holds the forming tool in such a manner that the corrugated circular ridge of the form roller is directed toward and in contact with an outer surface of the cylindrical blank metal article rotatably held by the article holding structure; a biasing member that is incorporated with the tool holding structure to press the form roller against the outer surface of the cylindrical blank metal article with a given pressing force; and a powered moving structure that, when energized, moves at least one of the article holding structure and the tool holding structure in such a manner that the selected one moves in both a first direction perpendicular to an axis of the unselected one and a second direction parallel with the axis of the unselected one.
대표청구항
▼
What is claimed is: 1. A micro-roll forming device for providing a cylindrical blank metal article with a minute convexoconcave bearing surface, comprising: a powered article holding structure that, when energized, rotates the cylindrical blank metal article about its axis; a forming tool that incl
What is claimed is: 1. A micro-roll forming device for providing a cylindrical blank metal article with a minute convexoconcave bearing surface, comprising: a powered article holding structure that, when energized, rotates the cylindrical blank metal article about its axis; a forming tool that includes a form roller with a corrugated circular ridge; a tool holding structure that holds the forming tool in such a manner that the corrugated circular ridge of the form roller is directed toward and in contact with an outer surface of the cylindrical blank metal article rotatably held by the article holding structure; a biasing member that is incorporated with the tool holding structure to press the form roller against the outer surface of the cylindrical blank metal article with a given pressing force; a powered tool head that, when energized, moves the tool holding structure in both a first direction perpendicular to the axis of the cylindrical blank metal article and a second direction parallel with the axis of the cylindrical blank metal article; a control unit that controls the powered tool head in such a manner that the form roller of the forming tool moves in the second direction while contacting the outer surface of the cylindrical blank metal article at the corrugated circular ridge thereof with a given pressing force; and a pressure load detecting device that detects a pressure load applied to the form roller by the biasing member and feeds a corresponding information signal to the control unit to control the given pressing force. 2. A micro-roll forming device as claimed in claim 1, in which the control unit is configured to carry out: processing the corresponding information signal from the pressure load detecting device to derive the pressure load applied to the form roller; and energizing both the powered article holding structure and the powered tool head when the pressure load detected indicates a predetermined value. 3. A micro-roll forming device as claimed in claim 1, in which the biasing member and the pressure load detecting device are installed in the forming tool, and in which the pressure load detecting device is a piezoelectric load cell arranged to detect a load applied to the form roller from the biasing member. 4. A micro-roll forming device as claimed in claim 1, in which the corrugated circular ridge of the form roller is a minute convexoconcave pressing ridge including alternately arranged recesses and projections. 5. A micro-roll forming device as claimed in claim 1, in which a top of the corrugated circular ridge of the form roller is convexly rounded. 6. A micro-roll forming device as claimed in claim 4, in which each of the projections of the minute convexoconcave pressing ridge of the form roller has a top that is convexly rounded. 7. A micro-roll forming device as claimed in claim 6, in which the convexly rounded top of the ridge of the form roller satisfies the following inequality: description="In-line Formulae" end="lead"R ≦(H/2)횞{1+(B/2)2}description="In-line Formulae" end="tail" wherein: R: radius of curvature of the convexly rounded top; H: depth of a recess that is produced on the outer surface of the cylindrical blank metal article by the convexly rounded top; and B: width of the recess produced on the outer surface of the cylindrical blank metal article by the convexly rounded top. 8. A micro-roll forming device as claimed in claim 4, in which the alternately arranged recesses and projections of the minute convexoconcave pressing ridge are arranged to have the same pitch and in which the corrugated circular ridge of the form roller and the cylindrical blank metal article have a dimensional relation in diameter that induces a half-pitch displacement of a sequent helical corrugated line produced on the cylindrical blank metal article per each rotation of the cylindrical blank metal article. 9. A micro-roll forming device as claimed in claim 4, in which a length of each projection of the corrugated circular ridge in an axial direction is greater than a length of the same in a circumferential direction. 10. A micro-roll forming device as claimed in claim 1, in which the powered article holding structure comprises: a main stand having an electric motor installed therein, the main stand having a holder to hold one end of the cylindrical blank metal article, the holder being rotated when the motor is energized; and a press stand having a rotatable shaft that holds the other end of the cylindrical blank metal article. 11. A micro-roll forming device as claimed in claim 10, in which the holder of the main stand comprises: a holder shaft rotatably held by the main stand and driven by the electric motor, the holder shaft having a conical head; and a conical center recess formed in one end of the cylindrical blank metal article, the conical center recess intimately receiving the conical head of the holder shaft for rotating the cylindrical blank metal article with the force of the electric motor. 12. A micro-roll forming device as claimed in claim 11, further comprising: a stopper pin fixed to the conical head of the holder shaft; and a bore formed in the conical center recess of the cylindrical blank metal article, the bore receiving the stopper pin upon engagement between the conical head and the conical center recess. 13. A micro-roll forming device as claimed in claim 1, in which the cylindrical blank metal article is a blank camshaft of an internal combustion engine, the blank camshaft having a plurality of journal portions that are to be finished by the form roller. 14. A micro-roll forming device as claimed in claim 1, in which the cylindrical blank metal article is a blank piston of an internal combustion engine, the blank piston including a skirt portion that is to be finished by the form roller and stepped areas that are formed on the surface of the blank piston. 15. A micro-roll forming device as claimed in claim 14, further comprising: an angular position detector that detects an angular position of the blank piston that is under rotation; a memory that memorizes data that represent the position of the stepped areas; and a control unit that controls the powered tool head in accordance with information signals issued from the angular position detector and the memory. 16. A micro-roll forming device for providing a cylindrical blank metal article with a minute convexoconcave bearing surface, comprising: a powered article holding structure that, when energized, rotates the cylindrical blank metal article about its axis; a forming tool that includes a form roller with a corrugated circular ridge; a tool holding structure that holds the forming tool in such a manner that the corrugated circular ridge of the form roller is directed toward and in contact with an outer surface of the cylindrical blank metal article rotatably held by the article holding structure; a biasing member that is incorporated with the tool holding structure to press the form roller against the outer surface of the cylindrical blank metal article with a given pressing force; a powered tool head that, when energized, moves the tool holding structure in both a first direction perpendicular to an axis of the cylindrical blank metal article held by the powered article holding structure and a second direction parallel with the axis of the cylindrical blank metal article held by the powered article holding structure; a control unit that controls the powered tool head in such a manner that the form roller of the forming tool moves in the second direction while contacting the outer surface of the cylindrical blank metal article at the corrugated circular ridge thereof with a given pressing force; and a pressure load detecting device that detects a pressure load applied to the form roller by the biasing member and feeds a corresponding information signal to the control unit to control the given pressing force. 17. A micro-roll forming device for providing a cylindrical blank metal article with a minute convexoconcave bearing surface, comprising: a powered article holding structure that, when energized, rotates the cylindrical blank metal article about its axis; a forming tool that includes a form roller with a corrugated circular ridge; a tool holding structure that holds the forming tool in such a manner that the corrugated circular ridge of the form roller is directed toward and in contact with an outer surface of the cylindrical blank metal article rotatably held by the article holding structure; a biasing member that is incorporated with the tool holding structure to press the form roller against the outer surface of the cylindrical blank metal article with a given pressing force; and a powered tool head that, when energized, moves the tool holding structure in both a first direction perpendicular to the axis of the cylindrical blank metal article and a second direction parallel with the axis of the cylindrical blank metal article; wherein the corrugated circular ridge of the form roller is a minute convexoconcave pressing ridge including alternately arranged recesses and projections; wherein each of the projections of the minute convexoconcave pressing ridge of the form roller has a top that is convexly rounded; wherein the convexly rounded top of the ridge of the form roller satisfies the following inequality: description="In-line Formulae" end="lead"R ≦(H/2)횞{1+(B/2)2}description="In-line Formulae" end="tail" wherein: R: radius of curvature of the convexly rounded top; H: depth of a recess that is produced on the outer surface of the cylindrical blank metal article by the convexly rounded top; and B: width of the recess produced on the outer surface of the cylindrical blank metal article by the convexly rounded top. 18. A micro-roll forming device for providing a cylindrical blank metal article with a minute convexoconcave bearing surface, comprising: a powered article holding structure that, when energized, rotates the cylindrical blank metal article about its axis; a forming tool that includes a form roller with a corrugated circular ridge; a tool holding structure that holds the forming tool in such a manner that the corrugated circular ridge of the form roller is directed toward and in contact with an outer surface of the cylindrical blank metal article rotatably held by the article holding structure; a biasing member that is incorporated with the tool holding structure to press the form roller against the outer surface of the cylindrical blank metal article with a given pressing force; and a powered tool head that, when energized, moves the tool holding structure in both a first direction perpendicular to the axis of the cylindrical blank metal article and a second direction parallel with the axis of the cylindrical blank metal article; wherein the corrugated circular ridge of the form roller is a minute convexoconcave pressing ridge including alternately arranged recesses and projections; wherein the alternately arranged recesses and projections of the minute convexoconcave pressing ridge are arranged to have the same pitch and in which the corrugated circular ridge of the form roller and the cylindrical blank metal article have a dimensional relation in diameter that induces a half-pitch displacement of a sequent helical corrugated line produced on the cylindrical blank metal article per each rotation of the cylindrical blank metal article.
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