Patents Assigned to Kabushiki Kaisha Okuma Tekkosho
  • Patent number: 5270915
    Abstract: An apparatus for generating numerical control information which is supplied with data on a shape of a workpiece for each machining step and which generates the numerical control information based on the shape data for each machining step includes: a judging section for judging, based on the operation type of a changed machining process to be inputted in order to change a previously stored machining step, whether or not it is necessary to regenerate the shape data for each changed machining step and a regenerating section for regenerating the shape data for each changed machining step on a basis of the result of the judgement by the judging section and the previously stored shape data for each machining step.
    Type: Grant
    Filed: February 20, 1991
    Date of Patent: December 14, 1993
    Assignee: Kabushiki Kaisha Okuma Tekkosho
    Inventors: Hiroki Tomita, Tomohiro Suzuki
  • Patent number: 5270941
    Abstract: A numerical control apparatus for controlling a numerical lathe has a superimposing Z-axis control function in which, when a work is machined by the control of movement of a tool holder in the Z2- and X2-axis directions driving movement of a spindle in the Z1-axis direction, the variance of the position of the spindle in the Z1-axis direction as detected by a Z1-axis position detector is added to the value derived from a Z2-axis position detector which detects the position of the tool holder in the Z2-axis direction, and the position of the second tool holder in the Z2-axis direction is controlled using the result of the addition as the feedback value of the Z2-axis position of the second tool holder.
    Type: Grant
    Filed: January 25, 1991
    Date of Patent: December 14, 1993
    Assignee: Kabushiki Kaisha Okuma Tekkosho
    Inventors: Yoshimaro Hanaki, Keiichi Ota
  • Patent number: 5255200
    Abstract: A numerical control information generating system prevents a tool from interfering with a work when the tool is moved from a tool change position to a cycle start point or from a cycle end point to the tool change position by setting a step start point and a step end point for each machining step outside of a before-machining shape, and classifying the positional relation of the shape upon completion of machining with the machining steps into the outer face, inner face, the front face, the outer rear face and the inner rear face so that based on the information denoting the positional relation the paths of the tool from the tool change position to the step start point or from the step end point to the tool change position are determined. When a same tool is used for machining in plural sequential steps, the time required to move the tool between the step to another can be shortened since the tool is moved from the end point of a step to the start point of the subsequent step.
    Type: Grant
    Filed: December 4, 1990
    Date of Patent: October 19, 1993
    Assignee: Kabushiki Kaisha Okuma Tekkosho
    Inventors: Yoshio Torizawa, Yukinori Otsubo, Kenji Ito
  • Patent number: 5255201
    Abstract: A numerical control information generating apparatus has a function of automatically correcting machining conditions by calculating corrected machining conditions from corrected numerical control information. The apparatus also has a valid/invalid setting function of automatically correcting machining conditions for the purpose of allowing an operator to select at will the conditions under which the function of automatically correcting machining condition works, and a numerical control information correcting section, in which a machining conditions automatic correction command is provided, so as to perform machining conditions automatic correction at any time as required. As a result, since machining conditions are corrected automatically by correcting numerical control information, an operator can set proper machining conditions easily even if the operator does not understand the relationship between the machining conditions and the generated numericaL control information.
    Type: Grant
    Filed: March 21, 1991
    Date of Patent: October 19, 1993
    Assignee: Kabushiki Kaisha Okuma Tekkosho
    Inventor: Takeharu Maeda
  • Patent number: 5251143
    Abstract: An NC program generating apparatus corrects the start and end points of a machining command with suitable patterns obtained by automatic judgement, as well as checking whether or not interference with the part shape occurs to thereby easily form an NC program which is free of collision, excessive or insufficient cutting or the generation of fins.
    Type: Grant
    Filed: December 7, 1990
    Date of Patent: October 5, 1993
    Assignee: Kabushiki Kaisha Okuma Tekkosho
    Inventor: Takeharu Maeda
  • Patent number: 5245544
    Abstract: For the function of forming numerical control information prior to machining process, the type of machining (such as drilling, end milling, outer diameter end face, etc.) and machining scope for each machining area is determined by inputting the shapes of a work and a part determining the machining areas based on said shapes, identifying the areas for inner diameter machining out of said machining areas, extracting from said inner diameter machining areas those characteristic areas to the inner diameter machining such as the area where a rear end face exists on the part shape, where a through hole is unprocessed or where a through hole is bored on the work based on the shape elements. As this method does not require preliminary reviewing of the machining method for inner diameter (and especially for small diameter), it allows beginner operators to produce numerical control information as easily as a skilled operator.
    Type: Grant
    Filed: November 21, 1990
    Date of Patent: September 14, 1993
    Assignee: Kabushiki Kaisha Okuma Tekkosho
    Inventors: Kyoichi Yamamoto, Yasushi Fukaya, Kenji Ito
  • Patent number: 5239478
    Abstract: In a method for determining a groove machining process based on numerical control information generating functions, a groove machining process is automatically determined based on characteristics of shape elements adjacent to groove shape elements as well as the shapes of the groove shape elements. The groove machining process can therefore be easily optimized.
    Type: Grant
    Filed: December 7, 1990
    Date of Patent: August 24, 1993
    Assignee: Kabushiki Kaisha Okuma Tekkosho
    Inventors: Kyoichi Yamamoto, Kenji Ito, Hiroki Tomita
  • Patent number: 5233535
    Abstract: In a control method and device for tapping, the phase difference between the spindle and the feed shaft at suspended positions is made equal to zero by controlling the rotation of the spindle of the feed of the feed shaft in a manner to minimize the damage on the machined portion and the rotation of the spindle and feed on the feed shaft are subsequently synchronized to reset them to their starting positions, thereby enabling an automatic reset operation.
    Type: Grant
    Filed: March 30, 1990
    Date of Patent: August 3, 1993
    Assignee: Kabushiki Kaisha Okuma Tekkosho
    Inventors: Norio Ito, Masato Ryoki
  • Patent number: 5206813
    Abstract: When a position of a tool blade tip for displaying the work shape, tool shape and tool locus is calculated by an interpolation arithmetic operation based on the interpolation instruction and feed speed instruction within a numerical control data, the calculated position of the tool blade tip is compared with the display scope every time an interpolation arithmetic operation is conducted; a determination is made as to whether or not the tool shape and tool locus to be displayed are inside of the display scope, and when they exist outside, uses a higher speed as the feed speed for the interpolation arithmetic operation. Therefore, even when an operator tries to check numerical control data by reducing the display scope for local graphic display, the interpolation outside the display scope can be conducted at a higher speed to thereby allow the operator to check the numerical control data quickly and immediately.
    Type: Grant
    Filed: November 21, 1991
    Date of Patent: April 27, 1993
    Assignee: Kabushiki Kaisha Okuma Tekkosho
    Inventors: Yukinori Otsubo, Tomohiro Suzuki, Yasushi Fukaya
  • Patent number: 5202842
    Abstract: A rotational position detecting apparatus detects the rotational position of a rotating object and compensates for an eccentricity of the rotating object. First and second sensors generate first and second detection signals having phases offset relative to each other. An error signal denoting the eccentricity of the rotating object is generated in accordance with a fluctuation of an amplitude signal corresponding to a difference between amplitudes of the first and second detection signals. The error signal is added to a position signal to obtain a eccentricity compensated rotational position detection signal.
    Type: Grant
    Filed: July 17, 1992
    Date of Patent: April 13, 1993
    Assignee: Kabushiki Kaisha Okuma Tekkosho
    Inventor: Masumi Suzuki
  • Patent number: 5184294
    Abstract: An apparatus for generating numerical control (NC) information automatically determines a division point if two steps are required for machining a part member, and produces NC information for each of divided portions, thereby reducing the time taken to prepare NC information for overall machining. The apparaus includes a division point determination unit for determining a division point between first and second steps based on a material shape, a part shape and a jaw shape supplied: a part shape division unit for generating a first step part shape and a second step part shape based on the division point, the material shape and the part shape: and a material shape division unit for generating a first step material shape and a second step material shape based on the division point, the material shape and the part shape.
    Type: Grant
    Filed: April 26, 1990
    Date of Patent: February 2, 1993
    Assignee: Kabushiki Kaisha Okuma Tekkosho
    Inventor: Yasushi Fukaya
  • Patent number: 5175688
    Abstract: On a display device, one or more machining portions in the entire working surface of a workpiece are displayed as image variations in gradiation, hue or tone throughout in a direction normal to the axis of the workpiece, to thus facilitate recognition of the machining state. A graphic display system is combined with a numerical control grinding machine to display images of a workpiece being machined and its working surfaces. The workpiece is displayed on the display device as a projection thereof on a plane parallel to the axis of the workpiece. Machining portions in the entire working surface of the workpiece are displayed in gradation, hue or tone changes, throughout in a direction normal to the axis of the workpiece, in accordance with changes in the cut-away amount.
    Type: Grant
    Filed: November 27, 1989
    Date of Patent: December 29, 1992
    Assignee: Kabushiki Kaisha Okuma Tekkosho
    Inventors: Shunichi Sasaki, Hiroaki Arai
  • Patent number: 5175689
    Abstract: A data processing apparatus generates data denoting a predetermined point on a virtual surface shape formed denoting the basis of digitized data on a tool path for an inverted shape work piece, to thereby facilitates examination of the size of the inverted shape work piece. That is, digitized data obtained by scanning a model shape is input and edited to prepare digitized data representing a tool path for machining a work piece. The digitized data representing the tool path is converted to prepare a numerical control working program. Work piece examination data are also prepared based on denoting an arbitrary measurement point of a scanning probe, data denoting the measuring direction at the measuring point and the digitized data representing the tool path for machining the work piece.
    Type: Grant
    Filed: August 3, 1990
    Date of Patent: December 29, 1992
    Assignee: Kabushiki Kaisha Okuma Tekkosho
    Inventors: Hirokazu Matsushita, Yukio Hayakawa, Yoshiteru Iwata
  • Patent number: 5155696
    Abstract: In a position detecting apparatus, digital signals in the presence of excitation signals are corrected by digital signals in the absence of excitation signals which are off-set values generated by each components of this postiion detecting apparatus. It therefore eliminates troublesome adjustment by variable resistors, and achieves precise position detection at any time without errors. Furthermore, since signals in the direction opposite to exciting signals are applied to the resolver upon the completion of excitation, the output of the resolver quickly becomes stable in the non-excited state, and off-set values are measured at a high speed.
    Type: Grant
    Filed: April 18, 1990
    Date of Patent: October 13, 1992
    Assignee: Kabushiki Kaisha Okuma Tekkosho
    Inventors: Shinji Shibata, Yasukazu Hayashi
  • Patent number: 5150303
    Abstract: In a numerical control information generating apparatus and a method for determining machining modes thereof, machining areas are divided appropriately and machining modes most suitable for each divided area are determined. Therefore, the most efficient tool trace can be obtaianed and the overall cutting time can be shortened.
    Type: Grant
    Filed: March 15, 1990
    Date of Patent: September 22, 1992
    Assignee: Kabushiki Kaisha Okuma Tekkosho
    Inventors: Yasushi Fukaya, Yuto Mizukami
  • Patent number: 5144214
    Abstract: In a numerical control system which controls the rotational angle of a spindle in a numerically controlled machine and tool in synchronism with the position of a feed axis based on a data table storing information for positional commands for the feed axis in correspondence with the rotational angle of the spindle, a universal purpose turning operation is effected at a higher efficiency by generating a marker pulse when a value set by counting the pulses in A- and B-phases from a spindle pulse generator has reached a pre-set value, and by controlling synchronization during synchronized operation, based on the marker pulse instead of the marker phase pulse from the spindle pulse generator.
    Type: Grant
    Filed: May 22, 1990
    Date of Patent: September 1, 1992
    Assignee: Kabushiki Kaisha Okuma Tekkosho
    Inventors: Toshiteru Komatsu, Kunio Miura
  • Patent number: 5136903
    Abstract: In the present invention, a machining range for each chucking can be determined automatically by inputting a final work shape and a starting material shape. Therefore, the burden on the operator can be reduced. That is, the present invention is a method for automatically determining a machining range, comprising the step of inputting a final work shape and a starting material shape for a lathe turning machining operation and automatically collectively determining one or more chucking places and corresponding lathe turning machining ranges which will result in the production the desired final work shape. Further, the present invention is an automatic programming system for controlling lathes, comprising a machining range determination portion that collectively determines one or more chucking places and corresponding lathe turning machining ranges, which will result in the production of the desired final work shape, on the basis of the final work shape and the starting material shape.
    Type: Grant
    Filed: November 8, 1990
    Date of Patent: August 11, 1992
    Assignee: Kabushiki Kaisha Okuma Tekkosho
    Inventor: Akira Hibi
  • Patent number: 5117368
    Abstract: A tapping device generates a cycle suspension squence by which a tapping process can be temporarily suspended and a cycle restart sequence by which the suspended tapping process can be restarted, thereby securing a safe operation at the time of an abnormality in the tapper or at trial cutting. Tapping wherein tapping is controlled by synchronizing the rotation of a spindle and the feed on a feed shaft. The device includes a sequence generating section which generates a tapping sequence for execution of said the tapping process, a cycle suspension sequence which slows down and suspends in synchronism the rotation of the spindle and the feed on said feed shaft to sumit detachment of the tapper from the work, and a cycle restart sequence which resumes the tapping process. A memory is provided which stores the detected oriented angle of the spindle for the start of cutting in the tapping sequence.
    Type: Grant
    Filed: March 29, 1990
    Date of Patent: May 26, 1992
    Assignee: Kabushiki Kaisha Okuma Tekkosho
    Inventors: Takahiro Yamaguchi, Takahiko Kitade
  • Patent number: 5115401
    Abstract: The method for automatically correcting deflection of a stylus in a digitizing device enables correction of the displacement of the stylus. The coefficient of deflection correction is calculated by utilizing the fact that the displacement and deflection of the stylus are both in proportion to the contact pressure between the stylus and a three-dimensional model.
    Type: Grant
    Filed: November 27, 1989
    Date of Patent: May 19, 1992
    Assignee: Kabushiki Kaisha Okuma Tekkosho
    Inventors: Hiroshi Oyama, Takao Hasebe
  • Patent number: 5112169
    Abstract: In the thread cutting method according to the present invention, the cutting amount S in each of the thread cutting operations from the second thread cutting operation to the (N-1)th thread cutting operation can be made less than and closest to the allowable cutting amount S.sub.p in each of the thread cutting operations by respectively determining as the cutting amount S.sub.1 in the first thread cutting operation and the cutting amount S.sub.n at a cutting depth which corresponds to the bottom of thread the values which are less than and closest to the allowable cutting amount S.sub.p obtained at the two cutting depths. In consequence, wear of the tool can be reduced and the time required for the thread cutting process can be shortened while the thread cutting accuracy can be maintained high by determining either of two equations from the prerequisites and the processing conditions and then by designating the equation to be adopted.
    Type: Grant
    Filed: May 9, 1991
    Date of Patent: May 12, 1992
    Assignee: Kabushiki Kaisha Okuma Tekkosho
    Inventors: Masato Ryoki, Kenji Ito