JPS62114830A - Wire electro-discharge machine - Google Patents

Abstract

PURPOSE:To keep tension constant and prevent disconnection from occurring as well as to improve the extent of accuracy, by installing the movable pulley supported by a member having a spring and a damping device on a wire electrode feed route, and shifting it with a tension variation in a wire electrode. CONSTITUTION:In the case where a tension variation in a wire electrode 10 to be produced by microscopic intermittent rotation due to anertia in a bobbin 12 is produced, a pulley of a movable pulley part 50 goes up in a state of rotation being stopped, but it goes down in a state of being overrotated. These movements are transmitted to the spring locked to an arm whereby a tension variation is relieved, and as canceling vibrations in the pulley due to repetition of stoppage and overrotation, an increase in the tension variation due to resonance is checked by a damping member having a proper damping factor. In consequence, the tension variation in the wire electrode 10 is not transmitted to the movable pulley part 50 afterward, therefore tension is kept constant and disconnection is prevented from occurring, thus accuracy is improved.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to a nine-wire electrical discharge machining apparatus equipped with a wire electrode tension fluctuation suppressing mechanism.

[Conventional technology]

FIG. 5 is a schematic diagram showing a wire path of a conventional wire electric discharge machining apparatus. In the figure, αO is a wire electrode, which is unwound from a wire bobbin (6).

(14a), (14b), (14C), and (14d) are idlers that change the running direction of the wire electrode head.

cL8 is the wire collection mechanism section, and the motor ul? ga is caused by. (1) is a brake roller, which applies tension to the wire electrode with a brake rod. (To) is the retention motor, apply a reverse torque to the wire bobbin @, and apply 1 retention to the wire electrode head. 4 is a workpiece, which is machined into a desired shape by generating electric discharge between the wire electrodes QCm by a power source (c). (7) The wires are the upper and lower wire guides, and are above the workpiece □□□.

The wire electrode αO is guided below. Button 02 is a nozzle, and its operation for spouting machining liquid onto the machining portion of the workpiece will be explained next. The wire (electrode head) is wire collection S.
By operating the motor of αQ, the wire is unwound from the bobbin a2, passes through the idler (brake roller (7) containing 14a and the idler (14b),
The upper die guide feeds the workpiece (c) to the desired position. Used wire electrodes are stored in the lower wire guide 02, idler (14d) and wire collection Fl structure α8.
After that, it is disposed of outside the main body of the device.

[Problem that the invention attempts to solve]

Since the conventional wire electrical discharge machining apparatus is machined as described above, the motor of the wire collection mechanism qe rotates at a constant speed due to the inertia of the wire bobbin α2, and the wire bobbin α0'
Despite unwinding, the rotation of the wire bobbin @
In terms of value, it is a reversal of stopping and over-speeding, and intermittent rotation. Due to the intermittent rotation, the tension of the wire electrodes 1 and 10 fluctuates, which causes a decrease in the loe accuracy of the wire electrical discharge machining apparatus. Furthermore, if the tension of the wire polarization αO increases during tension fluctuations, the wire electrode 00 will break, which may cause a reduction in the operating rate of the wire electrical discharge machining apparatus.

This invention was made to solve the above-mentioned problems, and aims to provide a wire processing device with high accuracy and high operation rate by suppressing the tension fluctuation of the wire electrode. With the goal.

[Means for solving problems]

The wire electrical discharge machining apparatus according to the present invention has a sophisticated arrangement of a movable pulley supported by a member having a spring and damping on the wire electrode feeding path.

[Function] In the wire electrical discharge machining apparatus according to the present invention, the movable pulley, which is provided on the wire electrode feeding path and supported by a member having a spring and damping, moves as the tension of the wire electrode changes; It is set without transmitting tension fluctuations between the wire electrodes and maintains a constant tension.

[Embodiments of the invention]

An embodiment of the present invention will be described below with reference to the drawings. 1st
The figure is a schematic diagram showing the wire path of the wire electrical discharge machining apparatus according to this embodiment, and FIG. 2 is a detailed diagram of the movable pulley section according to this embodiment. 1 and 2, the same reference numerals as in FIG. 5 indicate the same or corresponding parts. In these figures, (7) is a movable gooey portion, which is constructed as shown in FIG. 2. Number 6 is the boori, and the fulcrum (
The arm is rotatably supported by the arm.

The arm (to) is rotatably supported by a machine body (not shown) by a fulcrum trowel. (to) is a member having damping, for example, an air damper, a hydraulic damper, etc. can be used. (to) is a spring, and along with the damping member, all arms have fulcrums -, (
(to) is rotatably supported by one end, and the other end is fixed to the machine body.

In the wire electrical discharge machining apparatus configured as described above, when the tension fluctuation of the wire electrode αO occurs due to the microscopic intermittent rotation of the bobbin due to the inertia of the wire bobbin (1z), when the rotation is stopped, The pulley (2) on which the wire electrode 00 is stretched goes up, and the wire bobbin [in the over-rotated state due to the inertia of the wire bobbin (2), the pulley (2) goes down.

Because of the spring fixed to this moving arm,
Buffers pulse-like tension fluctuations. In addition, in order to cancel the upper and lower vibrations of the pulley (7) caused by repeated stops and over-rotations, a damping member having an appropriate damping coefficient is used to cancel tension fluctuations due to the resonance of the movement of the movable boob IJM and tension fluctuations. Due to the increased pressure, fluctuations in the tension of the wire electrode α0 cannot be affected after the movable pulley, and the set tension value can be maintained constant.

In the above embodiment, the movable pulley (7) has an arm structure that is a lever mechanism, but it may also have a structure that moves linearly on a track as shown in FIG. Furthermore, in the above embodiment, both the damping member (to) and the six springs are linear type, but the same effect can be achieved even if at least one is fully rotating type and fixed to the fulcrum part (■) as shown in Fig. 4. It has the effect of

〔Effect of the invention〕

As described above, according to the present invention, by providing a damping member and a movable pulley supported by a spring on the wire electrode feeding path, it is possible to completely absorb and eliminate tension fluctuations in the wire electrode. This has the effect of improving the machining accuracy of the wire electric discharge machining device, and also preventing the shear wire from breaking due to the tension being increased above the set value, making stable machining possible and improving the operating rate.

[Brief explanation of drawings]

FIG. 1 is a schematic diagram of a wire electrode path according to an embodiment of the present invention, FIG. 2 is a detailed diagram of a movable pulley section newly installed in this embodiment, and FIG. 6 and FIG. FIG. 5 is a schematic diagram showing a wire electrode path of a conventional wire electric discharge machining apparatus. In the figure,
Q□ is a wire electrode, +13 is a wire bobbin, Seki is a movable pulley, - is a member having damping, and phantom is a spring. Note that the same reference numerals in the figures indicate the same or similar parts. Agent: Tadashi Sato, Patent Attorney Figure 1 1o: Width 1 [6 to 12: Wapo, 5o: Movable prism, Figure 3, Figure 5

Claims (4)

[Claims] (1) A wire electrical discharge machining apparatus characterized in that a movable pulley supported by a member having a spring and damping is provided on a wire electrode feeding path. (2) The wire electrical discharge machining apparatus according to claim 1, wherein the movable pulley is movable by a lever mechanism. (3) The wire electric discharge machining apparatus according to claim 1, wherein the movable pulley is movable by a linear movement mechanism on a track. (4) The wire electrical discharge machining apparatus according to claim 1 or 2, wherein at least one of the spring and the damping member is of a rotary type.