Classifications

• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
  • B23H—WORKING OF METAL BY THE ACTION OF A HIGH CONCENTRATION OF ELECTRIC CURRENT ON A WORKPIECE USING AN ELECTRODE WHICH TAKES THE PLACE OF A TOOL; SUCH WORKING COMBINED WITH OTHER FORMS OF WORKING OF METAL
  • B23H7/00—Processes or apparatus applicable to both electrical discharge machining and electrochemical machining
  • B23H7/02—Wire-cutting
  • B23H7/08—Wire electrodes
  • B23H7/10—Supporting, winding or electrical connection of wire-electrode
  • B23H7/101—Supply of working media

Definitions

• TECHNICAL FIELD The present invention relates to a wire-cut electric discharge machine, and more particularly, to a power supply pin provided in at least the upper and lower wire guide devices attached to the upper and lower heads, respectively.
• TECHNICAL FIELD The present invention relates to a wire-cut electric discharge machine equipped with an improved cooling device for cooling water. Background art
• Electrode wire is supplied to the wire-cut electric discharge machine.
• the reel is fed from the reel through the brake drum for setting tension, the guide roller, the upper and lower heads, the motor driven winding roller, etc.
• the discharge voltage is supplied from the power supply bin to the electrode wire running between the upper and lower heads during this time, and the discharge is performed between the workpiece and the workpiece on the X, Y direction table.
• the head provided above and below the moving table is provided with the above-mentioned power supply pin and the electrode wire for the material to be processed.
• upper and lower wire guide devices including upper and lower wire guide duits and a cooling liquid supply path are provided.
• a machining current flows between the above-described upper and lower power supply pins and the workpiece to be machined, and the current value varies depending on machining conditions, but reaches an average of about 10 amperes.
• the electrode wire is usually 5 5 5
• the above-described coolant supply path and the surrounding area of the above wire guide are used.
• the coolant is guided to the coolant nozzle provided in the nozzle, and the coolant is sprayed onto the electrode wire facing the workpiece to cool it.
• the electrode wire needs to be cooled not only in the part facing the work to be processed but also in the part of the path that comes into contact with the wire guide from the contact point with the power supply pin. A part of the cooling liquid flowing through the liquid supply path is allowed to flow to the power supply pin through the fine hole formed as a branch path, and the electrode wire and the power supply bottle are also cooled. -.
• the coolant is set at a relatively high ejection pressure, for example, a high pressure value of 5 atm or more. For this reason, the pressure of the flowing coolant to the above-mentioned power supply pin also increases, and therefore, the coolant scatters outside the machine, thereby deteriorating the surrounding environment of the jet discharge machine, such as an adjacent There are inconveniences such as splashing on the processing machine.
• An object of the present invention is to incorporate a power supply pin cooling device capable of satisfying the above-mentioned needs at least in the upper wire guide device, and thereby to reduce the supply amount of the cooling water to the power supply pin according to a change in the supply pressure of the coolant. It makes it possible to make adjustments and achieve a proper cooling effect.
• an electrode wire guide means and an electrode pin for supplying a machining voltage to the electrode wire are provided.
• the coolant is supplied to the electrode wire guide means and the electrode pin from outside.
• Wire guide devices each having a cooling liquid supply path and a wire are arranged above and below a work to be processed, and electric discharge machining of the work is performed by an electrode wire running between the upper and lower wire guide devices.
• At least one of the upper and lower wire guide devices is connected to the coolant supply passage and is used for cooling the electrode wire toward the electrode guide means.
• a main flow path a branch flow path communicating with the main flow path, and a throttle valve provided in the branch flow path and having a flow path cross-sectional area adjusted to increase or decrease in accordance with the liquid pressure of the cooling liquid flowing from the outside into the cooling liquid supply path. And passed through the throttle valve And a water distribution means for guiding the coolant to the periphery of the electrode pin.
• FIG. 1 is a front view showing an embodiment of the present invention in which an improved power supply pin cooling means is incorporated in an upper guide device of a wire-cut electric discharge machine
• FIG. 2 is a sectional view of FIG. -Partial top view by the blue line
• Fig. 3 is a cross-sectional view showing the throttle valve structure used for the cooling means for the power supply pin
• Fig. 4 is the conventional upper guide for a wire-cut electric discharge machine.
• FIG. 2 is a cross-sectional view illustrating a configuration of the device. BEST MODE FOR CARRYING OUT THE INVENTION
• the upper wire guide device is provided with a bracket # 10 mounted on a head (not shown) of a wire cut electric discharge machine.
• a super-powered feed pin 12, an electrode wire guide roller 14, and a wire guide unit 16 are attached to this bracket 10, and an electrode wire 18.
• the wire guide unit 16 includes a lateral member 20, a guide holder 22, a jewel guide 2, a coolant nozzle forming member 26, and the like. The coolant introduced from the outside penetrates the bracket plate 10 and the horizontal plate member 20 forming another bracket ⁇ , and the coolant supplied through a part of the guide holder 22.
• the coolant nozzle 30 formed by the coolant nozzle forming member 26 passes through the lined main channel 28 and is sprayed onto the electrode wire 18.
• the coolant diverted from the lateral hole 32 formed in the guide holder 22 to the wire insertion hole of the guide holder 22 rises to reach the power supply pin 12, and the power is supplied during this time.
• the electrode wires 18 running between the pins 12 and the jewel guides 24 and the power supply pins 12 themselves are cooled.
• a coolant reservoir not shown
• Reference numeral 34 denotes a hole formed for forming the coolant supply main passage 28, which is normally closed by a cap 36.
• FIGS. 1 and 2 shows an example in which the present invention is applied to an upper wire guide device in a wire-cut electric discharge machine.
• the upper wire guide device has a bracket plate 40, and the bracket plate 40 is wire-bonded by bolt screws.
• the bracket # 4Q is provided with the lined electric pins 42 and the electrode wire guide rollers 44 pivotally attached thereto. Also, a V-groove guide below the guide roller 44
• a wire guide unit 50 is attached to a horizontal plate member 48 attached to the lower end of the bracket 40, and the wire guide unit 50 is a treasure as before. Die guide with built-in stone guide 52, this die guide
• the electrode wire 60 enters the die guide 52 from the lower end of the die guide 52, passes through the jewel guide, reaches the V-groove guide 46, and guides the V-groove guide 46.
• the power supply pin 42 is brought into contact with the power supply pin 42 and further travels up through the guide roller 44. Therefore, the electrode wire 58 below the lower end of the die guide 52 is cooled by the coolant injected from the nozzle 58, and this coolant is the same as in the above-described conventional upper wire guide device.
• the coolant flows from the supply pipe 62 connected to the coolant source to the coolant supply main path 64 formed on the bracket plate 40, and the coolant supply main path 6 is connected to the horizontal plate member 48 and the wire.
• the coolant is injected from the nozzle 58 by passing through the guide holder 54 of 50 and the base of the die guide 52 and communicating with the nozzle 58 formed by the nozzle forming member 56.
• the coolant flowing into the branch flow path 66 diverted from the coolant supply main path 64 is guided to the throttle valve 68, and the coolant is supplied to the throttle valve 68.
• the flow rate of the coolant is reduced when the fluid pressure is high.
• the coolant that has passed through the throttle valve 68 flows into the vicinity of the power supply pin 42 through the conduit 70 and the electrode that travels in the vicinity of the power supply pin 42. Cool wire 60.
• the present invention provides a power supply pin cover 72 detachably attached to the bracket plate 40, and a cooling liquid sump chamber 74 surrounding the power supply pins 42 inside the power supply bin cover 72.
• the cooling liquid sump chamber 7 is provided with a structure in which an appropriate amount of the cooling liquid flowing out of the above-mentioned conduit 70 is temporarily stored in the cooling liquid sump chamber 7 and then discharged to the outside. Therefore, the power supply pin 42 itself and the wire are cooled by the coolant in the coolant reservoir 74.
• the electrode wire 60 that has traveled upward from the guide unit 50 is cooled.
• Reference numeral ⁇ 6 is a discharge passage for discharging to the outside when the liquid amount in the cooling liquid sump chamber ⁇ 4 exceeds a predetermined amount.
• Reference numeral 78 denotes a holding pin when the power supply pin cover 72 is mounted on the bracket plate 40, and a pin formed at the upper end of the support column 80 implanted on the bracket plate 40. By attaching the holding pin 78 to the groove 82, the power pin cover 72 can be easily attached to the bracket plate 40, and can be removed. Needless to say, it is preferable to provide an appropriate leakage-prevention seal member 79 on the contact surface between the power supply pin cover 72 and the bracket or plate 40.
• the conduit ⁇ 0 is connected to the coolant reservoir 74 with a connection plug 70a.
• the throttle valve 68 is provided in the coolant supply pipe line to the lined power pin 42, and the throttle valve 68 is arranged as shown in FIG.
• the valve body 86 is formed by a metal cylinder, for example, a stainless steel cylinder, and the ball valve 88 is accommodated in the cylinder and the ball valve storage chamber 90, the main flow path 92, and the side flow path 9 and the outflow passage 96, etc., and when the ball valve 88 is displaced to the upper position shown by the dotted line in FIG. So that the coolant flows only from the side flow path 94 to the outflow path 96. Therefore, wire-cut electric discharge machines require high-pressure cooling for high-speed machining.
• the flow restricting effect of the throttle valve 68 reduces the cross-sectional area of the flow path of the cooling liquid and suppresses the flow rate, so that the amount of cooling liquid flowing to the power supply bin 42 is adjusted. You can do it. '
• the ball valve of the throttle valve 68 is used.
• Reference numeral 98 denotes a fall prevention pin of the ball valve 88, which is inserted into a lower portion of the valve body 86.
• the throttle valve 68 is attached to the bracket plate 40 by screwing or the like as shown in the figure.
• a throttle valve for increasing or decreasing the cross-sectional area of the flow passage in accordance with the fluid pressure in the coolant supply passage is provided for cooling the power supply pin in the wire-cut electric discharge machine. Therefore, even when the electric discharge machining speed is high and the supply pressure of the coolant is high, the flow circulating to the power supply pin is suppressed to an appropriate amount, and the coolant can be prevented from scattering outside the machine. When the speed is relatively low and the supply pressure of the coolant is low, a sufficient amount of coolant is supplied to the power supply pin. Therefore, an effect is obtained that the power supply pin and the electrode wire near the power supply pin can always be kept in an appropriate cooling state.
• the lower wire guide device may be provided with a power supply pin cooling device having a similar throttle valve as necessary. Preparation May be

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• Chemical & Material Sciences (AREA)
• Chemical Kinetics & Catalysis (AREA)
• Electrochemistry (AREA)
• Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• Electrical Discharge Machining, Electrochemical Machining, And Combined Machining (AREA)

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Citations (2)

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• 1984
  • 1984-08-27 JP JP59176702A patent/JPS6156827A/ja active Granted
• 1985
  • 1985-08-16 DE DE8585904144T patent/DE3584514D1/de not_active Expired - Lifetime
  • 1985-08-16 US US06/859,988 patent/US4707580A/en not_active Expired - Lifetime
  • 1985-08-16 WO PCT/JP1985/000458 patent/WO1986001445A1/ja active IP Right Grant
  • 1985-08-16 EP EP85904144A patent/EP0193610B1/en not_active Expired - Lifetime

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