Patents by Inventor Hisashi Otsubo
Hisashi Otsubo 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).
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Patent number: 7487005Abstract: A process planning apparatus extracts a region to be machined based on the difference of the shape data before and after machining of the workpiece, replaces the extracted region into combinations of the predetermined machining features, allocates a predetermined fixed cycle to each of the replaced machining features, and applies an assessment function relating to a machining time and a life of the end mill to each of the combinations of the machining features to which the fixed cycles are respectively allocated, thereby selecting a group of the fixed cycles which makes an assessment value obtained by the assessment function optimum as the optimal process. By these steps, it becomes possible to design the process for causing the NC machine employing end mills as a cutting tool to perform a predetermined machining of a workpiece without relying on the experience of the designer, and without necessitating complicated work.Type: GrantFiled: October 20, 2005Date of Patent: February 3, 2009Assignees: Mori Seiki Co., Ltd., Yasda Precision Tools K.K., Yamazaki Mazak Corp., Mitsubishi Electric Corp.Inventors: Yoshiaki Kakino, Atsushi Matsubara, Iwao Yamaji, Yoshifumi Fujita, Hidenori Saraie, Hisashi Otsubo, Yoshinori Yamaoka, Tomonori Sato
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Patent number: 7101126Abstract: End-mill machining control method and apparatus in which cutting forces tangential and normal to tool motion are detected and machining is controlled based on the detected cutting force values. A primary component Ft and motion axis components Fx, Fy of a cutting force are determined from current values of a spindle motor and motion axis motors for tool feed. A cutting-engaged angle ?en is determined from a radius R of a tool and a depth of cut I into a workpiece. A motion direction angle ? is determined from distribution motion amounts ?X, ?Y to the axes. The cutting forces Fm, Fs tangential and normal to tool motion are determined from the primary component Ft and a motion axis component Fx or Fy whichever is the largest, the cutting-engaged angle ?en, the motion direction angle ?. The accuracy of the determined cutting forces Fm, Fs is high since they are determined from the primary component Ft less affected by disturbance and the largest axis component of the cutting force.Type: GrantFiled: April 29, 2004Date of Patent: September 5, 2006Assignees: Fanuc LTD, Yasuda Precision Tools K.K., Mori Seiki Co., Ltd., Manufacturing Technology Institute Inc.Inventors: Yoshiaki Kakino, Iwao Yamaji, Hideaki Inoue, Koji Matsuoka, Hirotoshi Otsuka, Hisashi Otsubo, Heisaburo Nakagawa, Masakazu Tabata
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Publication number: 20060089746Abstract: A process planning apparatus extracts a region to be machined based on the difference of the shape data before and after machining of the workpiece, replaces the extracted region into combinations of the predetermined machining features, allocates a predetermined fixed cycle to each of the replaced machining features, and applies an assessment function relating to a machining time and a life of the end mill to each of the combinations of the machining features to which the fixed cycles are respectively allocated, thereby selecting a group of the fixed cycles which makes an assessment value obtained by the assessment function optimum as the optimal process. By these steps, it becomes possible to design the process for causing the NC machine employing end mills as a cutting tool to perform a predetermined machining of a workpiece without relying on the experience of the designer, and without necessitating complicated work.Type: ApplicationFiled: October 20, 2005Publication date: April 27, 2006Applicants: Yoshiaki KAKINO, Kyoto University, Mori Seiki Co., Ltd., Yasda Precision Tools K.K., Yamazaki Mazak Corporation, Mitsubishi Electric CorporationInventors: Yoshiaki Kakino, Atsushi Matsubara, Iwao Yamaji, Yoshifumi Fujita, Hidenori Saraie, Hisashi Otsubo, Yoshinori Yamaoka, Tomonori Sato
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Publication number: 20040258495Abstract: End-mill machining control method and apparatus in which cutting forces tangential and normal to tool motion are detected and machining is controlled based on the detected cutting force values. A primary component Ft and motion axis components Fx, Fy of a cutting force are determined from current values of a spindle motor and motion axis motors for tool feed. A cutting-engaged angle &agr;en is determined from a radius R of a tool and a depth of cut I into a workpiece. A motion direction angle &bgr; is determined from distribution motion amounts &Dgr;X, &Dgr;Y to the axes. The cutting forces Fm, Fs tangential and normal to tool motion are determined from the primary component Ft and a motion axis component Fx or Fy whichever is the largest, the cutting-engaged angle &agr;en, the motion direction angle &bgr;. The accuracy of the determined cutting forces Fm, Fs is high since they are determined from the primary component Ft less affected by disturbance and the largest axis component of the cutting force.Type: ApplicationFiled: April 29, 2004Publication date: December 23, 2004Applicants: Yoshiaki KAKINO, Heisaburo NAKAGAWA, FANUC LTD, YASUDA PRECISION TOOLS K.K., MORI SEIKI CO., LTD, Manufacturing Technology Institute Inc.Inventors: Yoshiaki Kakino, Iwao Yamaji, Hideaki Inoue, Koji Matsuoka, Hirotoshi Otsuka, Hisashi Otsubo, Heisaburo Nakagawa, Masakazu Tabata
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Patent number: 6772039Abstract: A maximum undeformed chip thickness, a cutting arc length or an engage angle, and an active angle for each tooth of the end mill are calculated when a ball end mill is used in machining, or the maximum undeformed chip thickness, the cutting arc length or the engage angle, and an axial depth of cut for each tooth of the end mill are calculated when a straight end mill is used in machining. Then, the estimated value of the cutting force Fxy or Fxyz in each portion of the tool path is calculated on the basis of a response surface whose explanation variables are composed of the above-mentioned calculated values, whereby the feed rate contained in an equation for the maximum undeformed chip thickness tm is determined to maintain the obtained estimated value of the cutting force Fxy or Fxyz at an appropriate value.Type: GrantFiled: August 30, 2002Date of Patent: August 3, 2004Assignees: Graphic Products, Inc., Yasda Precision Tools K.K., Mori Seiki Co., Ltd.Inventors: Yoshiaki Kakino, Heisaburo Nakagawa, Hirotoshi Ohtsuka, Masakazu Tabata, Hisashi Otsubo
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Patent number: 6650960Abstract: A machining control system maintaining optimum machining states and enhancing efficiency and reliability even when an actual machining environment fluctuates. The machining control system includes a machining information determination portion for determining initial machining conditions on the basis of information stored in a machining data base and in accordance with adaptive control characteristics defined by adaptive control modes and adaptive control parameters, and an adaptive control portion for controlling machining by changing the machining conditions in accordance with the machining states observed during machining with the initial machining conditions as an initial value of the machining conditions.Type: GrantFiled: March 8, 2001Date of Patent: November 18, 2003Assignees: Mitsubishi Denki Kabushiki Kaisha, Mori Seiki Co., Ltd., Yasda Precision Tools K.K., Osaka Kiko Co., Ltd., Yamazaki Mazak Kabushiki KaishaInventors: Yoshiaki Kakino, Tomonori Sato, Makoto Fujishima, Hisashi Otsubo, Hideo Nakagawa, Yoshinori Yamaoka
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Publication number: 20030125829Abstract: A maximum undeformed chip thickness, a cutting arc length or an engage angle, and an active angle for each tooth of the end mill are calculated when a ball end mill is used in machining, or the maximum undeformed chip thickness, the cutting arc length or the engage angle, and an axial depth of cut for each tooth of the end mill are calculated when a straight end mill is used in machining. Then, the estimated value of the cutting force Fxy or Fxyz in each portion of the tool path is calculated on the basis of a response surface whose explanation variables are composed of the above-mentioned calculated values, whereby the feed rate contained in an equation for the maximum undeformed chip thickness tm is determined to maintain the obtained estimated value of the cutting force Fxy or Fxyz at an appropriate value.Type: ApplicationFiled: August 30, 2002Publication date: July 3, 2003Inventors: Yoshiaki Kakino, Heisaburo Nakagawa, Hirotoshi Ohtsuka, Masakazu Tabata, Hisashi Otsubo
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Patent number: 6551033Abstract: A CNC tapping machine includes a spindle to which a tap is attached and a spindle motor for rotating the spindle. The load torque acting on the spindle motor that is detected when performing a tapping procedure without a workpiece is stored in a memory as referential, torque data. During a tapping procedure, a detection device detects the load torque acting on the spindle motor. A computer computes the difference between the load torque defected by the detection device and the referential load torque and uses the difference as the cutting load acting on the tap. As a result, the cutting load torque acting on the tap is accurately detected.Type: GrantFiled: January 29, 2001Date of Patent: April 22, 2003Inventors: Yoshiaki Kakino, Makoto Fujishima, Hisashi Otsubo, Hideo Nakagawa, Torao Takeshita, Yoshinori Yamaoka
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Patent number: 6437534Abstract: A control method for an NC machine tool is provided which ensures a high precision of the contouring control, and allows for extension of the drill life, and reduction in machining time.Type: GrantFiled: September 8, 2000Date of Patent: August 20, 2002Assignees: Mori Seiki Co., Ltd., Yasda Precision Tools K.K., Osaka Kiko Co., Ltd., Yamazaki Mazak Corporation, Mitsubishi Denki Kabushiki KaishaInventors: Yoshiaki Kakino, Makoto Fujishima, Hisashi Otsubo, Hideo Nakagawa, Yoshinori Yamaoka, Torao Takeshita
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Patent number: 6384560Abstract: An abnormality detection apparatus for a tool (11) is described for judging abnormalities of a tool by a uniformly set threshold value in relation to a cutting load even in a machining process wherein a feed rate changes every moment. The abnormalities of the tool can be judged by the uniformly set threshold value on the basis of the tool load wherefrom the feed load that fluctuates upon the feed rate has been removed.Type: GrantFiled: September 8, 2000Date of Patent: May 7, 2002Assignees: Mori Seiki Co., Ltd., Yasda Precision Tools K.K., Osaka Kiko Co., Ltd., Yamazaki Mazak Corporation, Mitsubishi Denki Kabushiki KaishaInventors: Yoshiaki Kakino, Makoto Fujishima, Hisashi Otsubo, Hideo Nakagawa, Yoshinori Yamaoka, Torao Takeshita
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Patent number: 6344724Abstract: A numerical control apparatus (1 or 20) comprising pecking operation controlling means (12) which make a feed drive system (14) retracted when a cutting load detected by cutting load detecting means (7) exceeds a reference value during a drilling process, the cutting load detecting means (7) comprise a bite load detecting section (8) to detect the cutting load at a biting stage wherein a tool bites a work piece, and a stationary load detecting section (10) to detect the cutting load after the biting stage. The numerical control apparatus (1 or 20) comprises pecking judgement means (11) to judge that the feed drive system (14) should be retracted when a fluctuation load exceeds a specified reference value wherein the fluctuation load is obtained by reducing the bite load from the detected stationary load. When it is judged that the feed drive system (14) should be retracted, the pecking operation controlling means (12) make the feed drive system (14) retracted.Type: GrantFiled: September 8, 2000Date of Patent: February 5, 2002Assignees: Mori Seki Co., Ltd., Yasda Precision Tools K.K., Osaka Kiko Co., Ltd., Yamazaki Mazak Corporation, Mitsubishi Denki Kabushiki KaishaInventors: Yoshiaki Kakino, Makoto Fujishima, Hisashi Otsubo, Hideo Nakagawa, Yoshinori Yamaoka, Torao Takeshita
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Publication number: 20010027354Abstract: There is provided a machining control system which is capable of keeping the optimum machining states and enhancing the efficiency and the reliability even in the case where an actual machining environment fluctuates. A machining control system includes a machining information determination portion (102) for determining initial machining conditions (107) on the basis of information (105) stored in a machining data base (101) and in accordance with adaptive control characteristics (106) defined by adaptive control modes and adaptive control parameters, and an adaptive control portion (103) for controlling the machining in appropriate states by changing the machining conditions in accordance with the machining states observed during the machining with the initial machining conditions (107) as an initial value of the machining conditions.Type: ApplicationFiled: March 8, 2001Publication date: October 4, 2001Inventors: Yoshiaki Kakino, Tomonori Sato, Makoto Fujishima, Hisashi Otsubo, Hideo Nakagawa, Yoshinori Yamaoka
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Publication number: 20010015116Abstract: A CNC tapping machine includes a spindle to which a tap is attached and a spindle motor for rotating the spindle. The load torque acting on the spindle motor that is detected when performing a tapping procedure without a workpiece is stored in a memory as referential, torque data. During a tapping procedure, a detection device detects the load torque acting on the spindle motor. A computer computes the difference between the load torque defected by the detection device and the referential load torque and uses the difference as the cutting load acting on the tap. As a result, the cutting load torque acting on the tap is accurately detected.Type: ApplicationFiled: January 29, 2001Publication date: August 23, 2001Inventors: Yoshiaki Kakino, Makoto Fujishima, Hisashi Otsubo, Hideo Nakagawa, Torao Takeshita, Yoshinori Yamaoka