Patents by Inventor Hirotsugu Kasai
Hirotsugu Kasai 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: 10737340Abstract: A dielectric working fluid processor for processing dielectric working fluid used in a wire electrical discharge machine includes: a dirty liquid tank for storing dielectric working fluid containing machining swarf; a filter for removing machining swarf from the dielectric working fluid in the dirty liquid tank; a clean liquid tank for storing the dielectric working fluid from which the machining swarf has been removed by the filter; a pump for supplying dielectric working fluid from the dirty liquid tank to the filter; an inverter for controlling electric power to be supplied to the pump; a pump controller for controlling the rotation speed of the pump by varying the frequency of electric power supplied from the inverter to the pump; and a feed pressure obtainer for obtaining the feed pressure of the dielectric working fluid supplied from the pump to the filter, based on the frequency of the electric power.Type: GrantFiled: September 17, 2018Date of Patent: August 11, 2020Assignee: FANUC CORPORATIONInventors: Hirotsugu Kasai, Hiroyuki Abe
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Publication number: 20190084064Abstract: A dielectric working fluid processor for processing dielectric working fluid used in a wire electrical discharge machine includes: a dirty liquid tank for storing dielectric working fluid containing machining swarf; a filter for removing machining swarf from the dielectric working fluid in the dirty liquid tank; a clean liquid tank for storing the dielectric working fluid from which the machining swarf has been removed by the filter; a pump for supplying dielectric working fluid from the dirty liquid tank to the filter; an inverter for controlling electric power to be supplied to the pump; a pump controller for controlling the rotation speed of the pump by varying the frequency of electric power supplied from the inverter to the pump; and a feed pressure obtainer for obtaining the feed pressure of the dielectric working fluid supplied from the pump to the filter, based on the frequency of the electric power.Type: ApplicationFiled: September 17, 2018Publication date: March 21, 2019Applicant: FANUC CORPORATIONInventors: Hirotsugu Kasai, Hiroyuki Abe
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Patent number: 10180344Abstract: A machining liquid is supplied to a predetermined level when a workpiece is on a table. A volume of the workpiece is obtained from a difference between the machining liquid amount at the predetermined level when a previous workpiece is not on the table, and the machining liquid amount when the workpiece is on the table. A weight of the workpiece is obtained from the obtained volume and a previously stored density of the workpiece. A weight of a mounting jig is obtained in the same procedure. A total volume of the jig and workpiece is obtained when the jig is on the table and the workpiece is fixed to the jig. The volume of the workpiece is obtained by a difference with respect to the volume of the jig. The weight of the workpiece fixed to the jig is obtained from the obtained volume and the previously stored density.Type: GrantFiled: July 27, 2016Date of Patent: January 15, 2019Assignee: FANUC CORPORATIONInventors: Hirotsugu Kasai, Hisanori Kouda
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Patent number: 10016831Abstract: A wire electric discharge machine is provided with a storage unit configured to store the flow rate of a machining fluid delivered to a sealing portion in a machining tank in association with the flow rate of the machining fluid delivered to a nozzle. The flow rate of the machining fluid delivered to the nozzle is measured, and the flow rate of the machining fluid to be supplied to the sealing portion is read from the flow rate storage unit and set, based on the measured flow rate.Type: GrantFiled: March 31, 2015Date of Patent: July 10, 2018Assignee: FANUC CORPORATIONInventors: Hirotsugu Kasai, Yoshinori Makino
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Patent number: 9993888Abstract: A wire electrical discharge machine recognizes that the finished piece (core) has been separated from the piece of work as a result of electrical discharge machining, allows fluid to be jetted against the finished piece (core) from the lower nozzle so that the finished piece (core) floats upward, recognizes that the finished piece (core) has floated upward by a predetermined amount on the basis of the completion of the process program or the information gained from the sensor, and allows the core removal unit to catch the finished piece (core) for removal and collection after it has been recognized that the finished piece (core) has floated upward by the predetermined amount.Type: GrantFiled: March 2, 2016Date of Patent: June 12, 2018Assignee: FANUC CORPORATIONInventors: Hirotsugu Kasai, Kaoru Hiraga
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Patent number: 9884276Abstract: A filter outer cylinder container is a hollow container, and a filter medium is mounted in the container. Fluid passage holes, opened in a side surface member of the filter outer cylinder container, are located at or above a fixed height from a bottom portion of the filter outer cylinder container, whereby a machining liquid is stored in the filter outer cylinder container, so that the filter medium can be always submerged in the machining liquid.Type: GrantFiled: September 2, 2014Date of Patent: February 6, 2018Assignee: FANUC CORPORATIONInventor: Hirotsugu Kasai
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Publication number: 20170030762Abstract: A machining liquid is supplied to a predetermined level when a workpiece is on a table. A volume of the workpiece is obtained from a difference between the machining liquid amount at the predetermined level when a previous workpiece is not on the table, and the machining liquid amount when the workpiece is on the table. A weight of the workpiece is obtained from the obtained volume and a previously stored density of the workpiece. A weight of a mounting jig is obtained in the same procedure. A total volume of the jig and workpiece is obtained when the jig is on the table and the workpiece is fixed to the jig. The volume of the workpiece is obtained by a difference with respect to the volume of the jig. The weight of the workpiece fixed to the jig is obtained from the obtained volume and the previously stored density.Type: ApplicationFiled: July 27, 2016Publication date: February 2, 2017Inventors: Hirotsugu KASAI, Hisanori KOUDA
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Publication number: 20160263689Abstract: A wire electrical discharge machine recognizes that the finished piece (core) has been separated from the piece of work as a result of electrical discharge machining, allows fluid to be jetted against the finished piece (core) from the lower nozzle so that the finished piece (core) floats upward, recognizes that the finished piece (core) has floated upward by a predetermined amount on the basis of the completion of the process program or the information gained from the sensor, and allows the core removal unit to catch the finished piece (core) for removal and collection after it has been recognized that the finished piece (core) has floated upward by the predetermined amount.Type: ApplicationFiled: March 2, 2016Publication date: September 15, 2016Inventors: Hirotsugu KASAI, Kaoru HIRAGA
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Publication number: 20150273601Abstract: A wire electric discharge machine is provided with a storage unit configured to store the flow rate of a machining fluid delivered to a sealing portion in a machining tank in association with the flow rate of the machining fluid delivered to a nozzle. The flow rate of the machining fluid delivered to the nozzle is measured, and the flow rate of the machining fluid to be supplied to the sealing portion is read from the flow rate storage unit and set, based on the measured flow rate.Type: ApplicationFiled: March 31, 2015Publication date: October 1, 2015Inventors: Hirotsugu KASAI, Yoshinori MAKINO
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Publication number: 20150060339Abstract: A filter outer cylinder container is a hollow container, and a filter medium is mounted in the container. Fluid passage holes, opened in a side surface member of the filter outer cylinder container, are located at or above a fixed height from a bottom portion of the filter outer cylinder container, whereby a machining liquid is stored in the filter outer cylinder container, so that the filter medium can be always submerged in the machining liquid.Type: ApplicationFiled: September 2, 2014Publication date: March 5, 2015Inventor: Hirotsugu KASAI
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Patent number: 8932459Abstract: A seal is brought into contact with a filter media, a filter pump is operated to start filtration, and a signal from a pressure sensor is received. When a predetermined value is exceeded by the signal from the pressure sensor, the filter pump is stopped, the seal is separated from the filter media, and take-up of one section of the filter by a filter collection roll is started. In finishing filter supply from a filter supply roll, drive of a motor is stopped, and an alarm signal is transmitted. If the supply is not to be finished, one section of the filter is taken up by the filter collection roll, and the next stage of filtration is entered.Type: GrantFiled: September 13, 2012Date of Patent: January 13, 2015Assignee: Fanuc CorporationInventor: Hirotsugu Kasai
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Publication number: 20140291295Abstract: In a taper machining using a wire electric discharge machine, a difference between a target tension value and an actual tension value of a wire electrode is fed back to a controller to determine input current values to a wire electrode feed motor and a wire electrode deliver motor, thereby adjusting the tension value of the wire electrode. When the taper angle of the wire electrode exceeds a given value, the control gain of the tension of the wire electrode for determining the input current value to the motor is lowered to prevent the wire electrode from oscillating.Type: ApplicationFiled: April 1, 2014Publication date: October 2, 2014Applicant: FANUC CorporationInventor: Hirotsugu KASAI
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Publication number: 20130161242Abstract: A seal is brought into contact with a filter media, a filter pump is operated to start filtration, and a signal from a pressure sensor is received. When a predetermined value is exceeded by the signal from the pressure sensor, the filter pump is stopped, the seal is separated from the filter media, and take-up of one section of the filter by a filter collection roll is started. In finishing filter supply from a filter supply roll, drive of a motor is stopped, and an alarm signal is transmitted. If the supply is not to be finished, one section of the filter is taken up by the filter collection roll, and the next stage of filtration is entered.Type: ApplicationFiled: September 13, 2012Publication date: June 27, 2013Applicant: FANUC CORPORATIONInventor: Hirotsugu KASAI
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Patent number: 8404991Abstract: A wire-cut electric discharge machine has a cooling device for cooling the machining fluid. A controller for controlling the cooling operation of the cooling device controls the machining fluid temperature by automatically switching, depending on the relationship between the ambient temperature of the wire-cut electric discharge machine and the temperature of the machining fluid, between a fixed temperature control mode in which the machining fluid temperature is maintained at a preset value and a differential temperature control mode in which the machining fluid temperature follows the ambient temperature to limit the difference between the machining fluid temperature and the ambient temperature to a preset range.Type: GrantFiled: August 23, 2011Date of Patent: March 26, 2013Assignee: Fanuc CorporationInventors: Hirotsugu Kasai, Ryou Nishikawa
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Publication number: 20120228201Abstract: An electric discharge unit of an electric discharge machine is disposed in a working tank, and a working fluid in the working tank is delivered to a filter tank by a pump. A filter for working fluid filtration wound off from a roll faces apertures in the bottom of the filter tank. When the internal pressure of the filter tank exceeds a predetermined value, the filter is moved a predetermined distance downward of the filter tank. In a position off the filter tank, that part of the filter which has been used for filtration is cleaned.Type: ApplicationFiled: November 10, 2011Publication date: September 13, 2012Applicant: FANUC CORPORATIONInventors: Hirotsugu KASAI, Yoshinori MAKINO
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Publication number: 20120048832Abstract: A wire-cut electric discharge machine has a cooling device for cooling the machining fluid. A controller for controlling the cooling operation of the cooling device controls the machining fluid temperature by automatically switching, depending on the relationship between the ambient temperature of the wire-cut electric discharge machine and the temperature of the machining fluid, between a fixed temperature control mode in which the machining fluid temperature is maintained at a preset value and a differential temperature control mode in which the machining fluid temperature follows the ambient temperature to limit the difference between the machining fluid temperature and the ambient temperature to a preset range.Type: ApplicationFiled: August 23, 2011Publication date: March 1, 2012Applicant: FANUC CORPORATIONInventors: Hirotsugu KASAI, Ryou NISHIKAWA