公开(公告)号：EP0246333A1

公开(公告)日：1987-11-25

申请号：EP86906930.2

申请日：1986-11-17

申请人： FANUC LTD.

发明人： OBARA, Haruki

IPC分类号： B23H7/06 ,  B23H7/04

CPC分类号： B23H7/065

摘要： Electric discharge wire cutting method which can realize high-precision cornering during tapering, and to an apparatus useful for practising this method. When carrying out the cornering during the tapering according to this invention, a wire cutting method which reduces a discharge working current and controls tension to be applied to a working electrode in proportion to changes in a Young's modulus of a working electrode is provided with a memory means (91) for storing information representing the relation between an electric discharge working current, and an optimum tension for the discharge working current, a working current monitoring means (12) for monitoring this electric discharge working current, an optimum tension calculation means (93) for determining the optimum tension corresponding to the working current detected by the working current monitor means (12), and a tension control means (92) for controlling the tension of the working electrode to the optimum tension provided by the optimum tension calculation means (93). The invention discloses also an electric discharge wire cutting apparatus which makes it possible to practise the electric discharge wire cutting method described above.

摘要翻译： 能够在锥形化期间实现高精度转弯的放电线切割方法以及用于实施该方法的装置。 当在根据本发明的锥形期间执行转弯时，将与放电工作电流相比减小并且控制施加到工作电极上的张力与根据工作电极的杨氏模量变化成比例的张力的线切割方法设置有记忆 用于存储表示放电工作电流和放电工作电流的最佳张力之间的关系的信息的装置（91），用于监视该放电工作电流的工作电流监视装置（12），最佳张力计算装置（93 ），用于确定与由工作电流监视装置（12）检测到的工作电流相对应的最佳张力;以及张力控制装置（92），用于将工作电极的张力控制到由最佳张力计算装置提供的最佳张力 93）。 本发明还公开了一种能够实施上述放电线切割方法的放电线切割装置。

公开(公告)号：EP0229188A1

公开(公告)日：1987-07-22

申请号：EP86904366.1

申请日：1986-07-04

申请人： FANUC LTD.

发明人： OBARA, Haruki ,  ASO, Toshiyuki ,  KINOSHITA, Hiroshi

IPC分类号： B23H7/10

CPC分类号： B23H7/10

摘要： A wire cut electric spark machine, in which a wire electrode (14) is sent from its supply unit (12) to a region for discharge machining of a workpiece (W), tensed between upper and lower heads (22, 26) and transferred to machine the workpiece (W) by discharge on a work table (24). When the breakage of the wire electrode is detected by a suitable detector during the discharge machining of the workpiece (W), the wire electrode is taken back and held in a position near the upper head (22) by a wire electrode feed means (40), and the broken end of the wire electrode (14) is detected by a wire end detector (66) outside the discharge machining region. The detected broken end of the wire electrode is repaired by using a cutter (60) and a blade receiving base (64) in a wire electrode repairing position which is provided apart from the discharge machining region, to remove the broken end. The repaired wire electrode (14) is set again between the upper and lower heads (22, 26) by using a jet nozzle (74) to resume the discharge machining of the workpiece.

公开(公告)号：EP0229186A1

公开(公告)日：1987-07-22

申请号：EP86903617.8

申请日：1986-06-24

申请人： FANUC LTD.

发明人： OBARA, Haruki

IPC分类号： B23H7/10 ,  B23H11/00

CPC分类号： B23H7/101

摘要： A wire cut electric spark machine consisting of a tapering table assembly (6a) which is fixed to the lower end of a vertical column (5a) provided above a work table (T) movable in the directions of X- and Y-axes crossing each other at right angles in a horizontal plane, and which is movable in the directions of U- and V-axes crossing each other at right angles in a horizontal plane which is parallel to the horizontal plane including the X- and Y-axes; a wire guide (7a) attached to the tapering table assembly (6a), having a nozzle for ejecting working fluid and adapted to guide a wire electrode (9); and balancing means (22,22a) adapted to apply a downward reaction, which is against reaction force of the ejected working fluid, to the tapering table assembly (6a), owing to a fluid pressure of a branching flow of the working fluid supplied to the nozzle for ejecting the working fluid of the wire guide (7a).

摘要翻译： 一种线切割电火花机，包括一个固定在设置在工作台（T）上方的垂直柱（5a）下端的锥形工作台组件（6a），所述工作台（T）沿X轴和Y轴方向移动， 另一个在水平面内呈直角，并且在与包括X和Y轴的水平面平行的水平面内，可以在相互垂直的U轴和V轴方向上移动; （6a）上的线导向件（7a），其具有用于喷射工作流体并适于引导线电极（9）的喷嘴; 和平衡装置（22,22a），所述平衡装置（22,22a）适于向所述锥形台组件（6a）施加抵抗所喷射的工作流体的反作用力的向下反作用力，这是由于供应给所述工作流体的工作流体的分支流的流体压力 用于喷射线引导件（7a）的工作流体的喷嘴。

公开(公告)号：EP0223861A1

公开(公告)日：1987-06-03

申请号：EP86903573.3

申请日：1986-05-29

申请人： FANUC LTD

发明人： OBARA, Haruki

IPC分类号： B23H1/02

CPC分类号： B23H1/022 ,  B23H2300/20

摘要： A power source for discharge machining, which electrically charges a capacitor (C1) that is connected in parallel with an electrode (P) and a work (W), and which applies a charging voltage (VC) across the electrode and the work, so that there takes place an electric discharge to perform the discharge machining. The power source for machining quickly charges the capacitor. Besides, it is tried to construct the power source at low cost and improve the power source efficiency. A charging circuit of the capacitor (C1) includes a switching element (T1 ) which can be turned on or off to connect the capacitor to a d-c power source (E) to electrically charge it. The charging circuit is further provided with a fly-wheel circuit which consists of an inductance (L1 ) and a diode (D1). An inverse voltage produced by a stray inductance (L2) in the discharge circuit during the discharge is applied as a forward voltage to the capacitor through the fly-wheel circuit.

公开(公告)号：EP0178330A1

公开(公告)日：1986-04-23

申请号：EP85901574.5

申请日：1985-03-25

申请人： FANUC LTD.

发明人： OBARA, Haruki ,  ITO, Masaya ,  TONOMURA, Masashi

IPC分类号： B23H1/02 ,  B23H7/04

CPC分类号： B23H7/04

摘要： @ A power source for wire cut electrospark maching wherein a voltage for machining and an inverse voltage are applied to a machining gap between a wire electrode (P) and a work (W), the inverse voltage being so controlled that the average voltage for machining applied thereto will be zero, in order to prevent electrolytic corrosion from taking place on the work (w). An inverse voltage time adjusting circuit (2) detects the average voltage for machining, and produces a pulse (S5) of a width corresponding to the detected voltage. This serves as the inverse voltage pulse width. The inverse voltage adjusting circuit (1) controls a transistor that applies inverse voltage, such that the inverse voltage applied to the machining gap remains constant.

公开(公告)号：EP0160104A1

公开(公告)日：1985-11-06

申请号：EP84903983.9

申请日：1984-10-26

申请人： FANUC LTD.

发明人： OBARA, Haruki

IPC分类号： B23H7/10

CPC分类号： B23H7/101

摘要： A wire electrode cooling apparatus for a wire-cut electric discharge machine cools a wire electrode (P) by introducing a working fluid to the inside of a guide member (11) which guides the wire electrode (P). The working fluid is introduced to the inside of the guide member (11) through a flow rate adjusting valve (17). The opening of the valve (17) is adjusted in accordance with the fluid pressure of the working fluid which changes with the machining speed. Thus, it is possible to properly maintain the fluid pressure of the working fluid in a machining area and to effect machining at both high and low speeds. In addition, the flow rate of the working fluid introduced to the inside of the guide member (11) is properly adjusted, whereby disconnection of the wire electrode (P) is prevented.

公开(公告)号：EP0157885A1

公开(公告)日：1985-10-16

申请号：EP84903756.9

申请日：1984-10-11

申请人： FANUC LTD

发明人： INOUE, Michiya ,  OBARA, Haruki ,  IZUMIYA, Shunzo

IPC分类号： B23P1/08

CPC分类号： B23H1/022 ,  B23H2300/20

摘要： A power supply apparatus for wire-cut electric discharge machining charges a capacitor (4) from a DC power source (2) through a switching element (1) and discharges the electric charge stored in the capacitor (4) to the gap between a work (6) and a wire electrode (7) through a switching element (5). The power supply apparatus supplies a single-polarity discharge current having a small pulse width to the gap between the wire electrode (7) and the work (6) and allows the capacitor (4) to be efficiently recharged. For this purpose, a series circuit of an impedance element (50, 80) other than capacitance and a diode (51) is connected in parallel to the capacitor (4), the diode (51) being connected in such a manner that its polarity is opposite to that of the voltage applied for the purpose of recharging the capacitor (4).

公开(公告)号：EP0067876A1

公开(公告)日：1982-12-29

申请号：EP81903076.8

申请日：1981-11-18

申请人： FANUC LTD.

发明人： GAMO, Gotaro ,  KINOSHITA, Mitsuo ,  OBARA, Haruki

IPC分类号： B23H7/06

CPC分类号： B23H7/065

摘要： A method of controlling a wire cut electric discharge machining apparatus which prevents machining error occurring due to deflection of a wire electrode (1) during the discharge machining when cutting a corner. This method controls the machining of the corner (CN) in accordance with a corner command speed or relative movement stopping time calculated from the amount of wire electrode deflection measured by stopping the electric discharge during linear machining.

公开(公告)号：EP0280735B1

公开(公告)日：1992-10-14

申请号：EP87905288.4

申请日：1987-08-12

申请人： FANUC LTD.

发明人： OBARA, Haruki

IPC分类号： B23H7/02 ,  B23H7/04

CPC分类号： B23H7/101 ,  B23H7/04

摘要： A wire cut electric discharge machining unit which effects machining by applying a voltage across a work and a wire, and pouring a machining liquid into the gap between the work and the wire. When it is difficult to bring the nozzle sufficiently close to the surface of the work, the liquid pressure in the nozzle is calculated from the height of the nozzle to vary the standard machining conditions depending upon the liquid pressure in the nozzle to thereby automatically find out optimum machining conditions. Machining conditions (M, t, r) are input from input means (1), and machining conditions (Vo, Tono, Toffo) of a standard wire cut electric discharge machining unit are selected from machining condition memory means (3). Liquid pressures (Pu, PL) of the nozzle are calculated by calculation means (2) from the nozzle heights (lu, lL) input from the input means (1). Machining condition varying means (4) gives to machining power source (5) the machining conditions (V, Ton, Toff) obtained by varying the standard machining conditions from the liquid pressures (Pu, PL) of the nozzle, whereby the practical machining is carried out under the modified machining conditions.

公开(公告)号：EP0343255B1

公开(公告)日：1992-04-29

申请号：EP88909838.0

申请日：1988-11-15

申请人： FANUC LTD.

发明人： OBARA, Haruki

IPC分类号： B23H7/02 ,  B23H7/04

CPC分类号： B23H7/04

摘要： A method and an apparatus for reliably detecting machining conditions of a wire-electrode discharge machine capable of experimentally finding machining conditions for effecting optimum and most efficient wire discharge cutting. Test machining is effected (S4) while the off period of the transistor of the power source of a discharge machine is gradually increased every predetermined working section. When the ratio of the change in machining speed to the change in the average machining current between the previous and present machining sections becomes smaller than a value equal to the product of a coefficient and the mean value of such ratios of all the preceding sections and smaller than the mean value (S7 to S10), the relationship between the machining current and machining speed is assumed to have lost linearity. The off period at this moment is adopted for actual machining (S13).