JPH01310824A - Wire exhausting device for wire-cut electric discharge - Google Patents

Abstract

PURPOSE:To control variation in the torque applied to a wire and prevent wire severance by furnishing a constant-torque speed adjusting mechanism in the drive system for a wire exhausting roller installed behind a transport belt mechanism to carry out the used wire. CONSTITUTION:A constant-torque speed adjusting mechanism 57 such as powder clutch and hysterysis clutch is arranged between the drive roller 55 of a wire exhausting roller 37 and a gear 51 of driving device 47. When therein a wire 27 fed by a transport belt 35 is exhausted by the wire exhausting roller 37, this speed adjusting mechanism 57 installed thereon absorbs slip in an amount corresponding to the speed difference even though a difference is generated between their feed speeds because of wear etc. of the transport belt 35. This enables keeping the wire tension between the rollers 53, 55 constant always to contribute to prevention of the wire from severance.

Description

[Detailed Description of the Invention] [Object of the Invention] (Industrial Field of Application) The present invention relates to a wire discharge device for a wire-cut electric discharge machine, and more particularly, to a wire discharging device for a wire cut electric discharge machine, and more specifically, to prevent wire breakage during discharge of a wire used in electric discharge machining. The present invention relates to a wire ejecting device that prevents the wire ejection.

(Prior art) Conventionally, for example, in a wire-cut electric discharge machine, a wire used for electric discharge machining is carried out as a means for carrying out the wire, and the wire is held between upper and lower conveying flat belts, and the belt is driven to remove the wire electrode. A device is used to discharge the air out of the aircraft.

However, in this device, the life of the belt is too short due to friction, so a method is used in which a roller for driving the wire electrode is provided behind the conveyor belt, and the wire is drawn in by this roller and discharged outside the machine. is common.

(Problem to be Solved by the Invention) In the wire N-pole discharging device as described above, the radius of the roller portion driving the conveyor belt 1 in consideration of the thickness of the belt and the radius of the wire drive roller are determined. There is a difference between
There is a slight difference between the wire conveyance speed by the belt and the retraction speed of the wire drive roller.

For this reason, particularly in wire electrodes having a small wire diameter, there is a problem that the wire may be cut due to the tension between the conveyor belt and the drive roller.

Therefore, this invention was devised in view of the above-mentioned problems, and includes a speed adjustment mechanism that maintains a constant torque in the drive system of the wire discharge roller, and controls changes in the torque applied to the wire to prevent wire breakage. The purpose of the present invention is to provide a wire discharge device for a wire-cut electric discharge machine.

"Structure of the Invention" (Means for Solving the Problems) In order to solve the above-mentioned problems, the present invention provides a wire-cut electrical discharge machine that uses a wire at the rear of a conveyor belt mechanism for transporting wires used in electrical discharge machining. A discharge roller is provided, and a speed adjustment mechanism with constant torque is provided in the drive system of the wire discharge roller.

(Function) With the above-mentioned configuration, a wire discharge roller equipped with a speed adjustment mechanism with a constant torque in the drive system is installed behind the conveyor belt that conveys the wire used in electrical discharge machining, so that the wire discharge roller is equipped with a speed adjustment mechanism that maintains a constant torque. Even if a speed difference occurs between the rollers, the wire tension generated between the rollers is kept constant by the speed adjustment mechanism, so that the wire will not be cut.

(Example) Hereinafter, an example of the present invention will be described in detail based on the drawings.

Referring to FIG. 2, FIG. 2 conceptually illustrates the overall configuration of a wire-cut electric discharge machine. The wire-cut electric discharge machine 1 includes a machining fluid receiver 5 on a base 3 and a column 7.

A movable table 11 equipped with a work lamp 9 that fixedly supports a workpiece W is supported above the machining liquid receiver 5 so as to be able to move two-dimensionally in the X-axis direction and the Y-axis direction.

An upper arm 13 is provided on the upper side of the column 7, and a slide 15 that moves up and down is mounted at the tip of the upper arm 13 so as to be able to adjust its vertical position. An upper nozzle holder 17 is attached to the lower end of the slide 15, and this upper nozzle holder 17 is equipped with one upper machining fluid supply nozzle.

Ic, on the side near the bottom of column 7 is upper arm 1.
3, the lower arm 21 is attached.

At the tip of the lower arm 21, there is an upper machining liquid supply nozzle 1.
A lower machining fluid supply nozzle 23 is mounted opposite to the lower nozzle holder 25 via a lower nozzle holder 25 . The upper machining fluid supply nozzle 19 and the lower machining fluid supply nozzle 23 function to inject and supply machining fluid such as distilled water to the electrical discharge machining section of the workpiece W, and also to guide and hold the wire 27 as an electrode. be.

A supply reel 29 is rotatably mounted on the top of the column 7 to continuously supply fine wire 27 to the electrical discharge machining section.

The wire 27 from the supply reel 29 passes through a plurality of rotatable upper guide rollers 31 provided from the column 7 to the upper nozzle holder 17, reaches the upper machining liquid supply nozzle 19, and from this upper machining liquid nozzle 19 The lower machining fluid supply nozzle 23 passes through the electrical discharge machining section of the workpiece W.
It has reached this point.

Further, the wire 27 is connected to a rotatable lower guide roller 33 provided in the lower nozzle holder 25 and the wire 27
a conveyor belt 35 that feeds out at a constant speed with the
A series of wire ejecting devices 41 consisting of wire ejecting rollers 37 provided behind the conveyor belt 35 move the base 3
The waste is discharged into a collection box 39 installed on the side of the container.

To explain the wire discharging device 41 in more detail, referring to FIG. 1, as conceptually shown, the wire 27, which is an electrode, is passed from two supply reels to the upper guide roller 31 and then to the upper machining fluid supply nozzle 19. and reaches the lower machining fluid supply nozzle 23.

A wire 27 stretched between the upper machining liquid supply nozzle 19 and the lower machining liquid supply nozzle 23 processes the workpiece W on the work table 9, which is moved by an electric motor via a drive system such as a screw member.

The wire 27 used for electrical discharge machining is guided by a lower guide roller 33 and conveyed while being pinched by conveyor bells 1 to 35, and is pinched by a wire discharge roller 37 provided on the discharge side of the conveyor bells 1 to 35. After being discharged, the wire 27 is stored in a collection box (not shown).

The drive system for the conveyance bells 1 to 35 and the wire discharge roller 37 is such that rotation is transmitted from the output shaft 45 of the electric motor 43 to a pinion 49 serving as a drive device 47, and the system is branched into left and right sides that mesh with the pinion 49. The drive roller 53 of the conveyor belt 35 and the drive roller 55 of the wire discharge roller 37 are driven by the gear 51.51.

Furthermore, a speed adjustment mechanism 57 with constant torque, such as a powder clutch or a hysteresis clutch, is provided between the drive roller 55 of the wire delivery roller 37 and the gear 51 of the drive device 47.

With the above configuration, when the wire 27 sent out by the conveyor belt 35 is discharged by the wire discharge roller 37, even if there is a speed difference between the mutual feed speeds due to wear of the conveyor belt 35, etc., the wire discharge roller 37 A speed adjustment mechanism 57 provided on the roller 37 slides and absorbs the speed difference.

For this reason, the wire tension between the rollers is always kept constant, so that cutting of the wire 27 can be prevented.

d3. It goes without saying that the present invention is not limited to the embodiments described above, and that various changes may be made without departing from the gist of the present invention.

[Effects of the Invention] As can be understood from the above description of the embodiments, the present invention provides a wire discharging roller behind the conveyor belt mechanism for discharging the wire used in electrical discharge machining in a wire-cut electrical discharge machine. Since the drive system of the wire discharge roller is equipped with a speed adjustment mechanism that maintains constant torque, the wire tension between the conveyor bell 1 and the wire discharge roller is kept constant and the wire is not cut. can be prevented.

[Brief explanation of the drawing]

FIG. 1 is an explanatory diagram conceptually illustrating an apparatus showing an embodiment of the present invention. FIG. 2 is an explanatory diagram conceptually showing the layout of the entire wire-cut electrical discharge machine. 1... Wire cut electric discharge machine 27... Wire 35... Conveyor belt 37... Wire discharge roller 57... Speed adjustment mechanism 41...
Wire discharge device agent Patent attorney Yasu Miyoshi 1...Wire sword F', tjj = Processing doctor Ken
27...Wire f 35.Transport belt 37...Wire discharge roller 41...Wire discharge, L1 public A 57...Speed adjustment 1q: Wire Fig. 1

Claims (1)

[Claims] A wire discharge roller is provided behind a conveyor belt mechanism for conveying the wire used in electrical discharge machining in a wire cut electric discharge machine, and a speed adjustment mechanism with constant torque is provided in the drive system of the wire discharge roller. Wire discharge device for wire cut electrical discharge machine.