JPS60232830A - Wire electrode automatic feeding device in wire electric discharge machining unit - Google Patents

Abstract

PURPOSE:To remarkably improve the rate of success in the automatic feeding of wire electrode by varying the tension of wire in plural stages corresponding to the types of wire electrodes, and varying wire electrode delivery force while automatically feeding a wire electrode. CONSTITUTION:When a paper tape 109 bearing information indicating the types of wire electrodes is inputted in an NC unit 105, in a control circuit of an electromagnetic brake installed in a brake roller, one of plural number of relays 110 is turned on corresponding to the type of a wire electrode since the wire electrode delivery force by a pinch roller while automatically feeding the wire electrode, is a value in which a brake torque and the reverse torque (nearly constant) of a wire feed reel are subtracted from the rotation torque of a pinch roller, the wire electrode delivery force can be varied by varying a brake torque. Thereby, the rate of success in automatically feeding a wire electrode can be remarkably improved.

Description

[Detailed Description of the Invention] [Technical Field of the Invention] The present invention relates to an automatic wire electrode feeding device in a wire electrical discharge machining device, and more particularly to a device having a function of controlling the wire feeding force during automatic feeding of the wire electrode. It is.

[Prior art]

One conventional device of this type is the one shown in Figure 1.

In FIG. 1, (1) is a wire supply reel, which is connected to a torque motor (not shown) and has a wire electrode (2).
Reverse torque is applied at the first moment to obtain a braking force that does not cause any damage. , (3) is a brake roller, which is connected to an electromagnetic brake (-not shown).
(4) is a presser roller, which is pressed against the brake roller (3) by spring force.

The wire electrode (2) is connected to these brake rollers (3)
(5) is a direction changing roller, (6) is a positioning die, and the inner diameter is the same as the wire electrode (2). ) is slightly larger than the diameter of the (7) is a pinch roller for wire feeding, and (8) is a press roller for wire feeding. The roller (7) is attached to the elevating plate (9) and rotated by the pinch roller motor αO only during automatic wire feeding, and the roller (8)
is pressed against the roller (7) by a spring force, and during automatic wire feeding 1. t, the wire electrode (2) is sandwiched between the rollers (7) and (8), and is fed downward in the figure without slipping. 2) is the roller (7), (8
), lifting and lowering (9J lifts and lowers using the lifting motor (6) and force...
・In the diagram of the elevating plate (9) above, which is connected by a puller and rotated by a ball screw (t), there is a bolt on the back side that converts the rotation of the hole screw (t) into vertical linear motion. A ball nut is installed.

The hole screw (2) is attached to the lifting guide α, and one end is supported by the motor mounting part α9, and the other end is supported by the bearing QG, making it a double-end support system.
The elevating plate (9) is supported by the elevating guide α, so it can move up and down in an accurate straight line. Fixed. This pipe guide 0
7 is supported by a bearing ring on the gamma frame to prevent shaking as it moves up and down as the elevating plate (9) moves up and down. Furthermore, one tie guide 4 for supporting the wire electrode (2) is attached to the tip of the pipe kite aη.

Note that the bearing Qf9.0 and the lifting guide α4 are fixed.

Temporary c! Next, (2) is the cutting motor, and the handle is the arm circuit motor, both of which are fixed to the box (c). , @ is a wire cutting section, (E) is a cutting arm, (A) is a T-shaped saucer for discarding wire scraps after wire cutting. ■The pipe guide αη attached to υ is pressed against the reference groove plate during machining and is fixed by the plate handle. V to fit
The position is determined by receiving it on the groove surface. Note that the reference V-groove plate ■ is always fixed to the box ■, and the box ■ is attached to the fixing plate Q]), and the machining fluid o]) is jetted into the box (7) and the machining section The first nozzle (c) for supplying to (to) is attached.

There are 8 notches in the pipe guide αη as shown in the figure, and during machining, the power supply bottle (to), 0
There are 5 wire electrodes (2), which are in contact with 8 wire electrodes (2), and the power supply bottle (to) from which power is supplied is fixed to the movable plate (to), and when the pipe guide αη moves up and down,
Move to the right in the diagram to avoid contact.

Similarly, the power supply bottle (to) is fixed to the movable plate (b), and when pressed to the left in the figure, moves together with the plate. The can is the workpiece, (to) is the table, and
) is the lower die guide, (9) is the lower power supply die station, both of which are fixed to the box (6) and attached to the lower arm (roller). 61
) A T-shaped nozzle (
Seven frames are attached, and one guide nozzle for guiding one wire electrode (2) is attached.

One wire electrode (2) passes through the guide nozzle (goods),
Belt roller, lower belt Q4''i)
and the lower roller, and is guided to the trumpet tube 09). Thereafter, the wire electrode (2) passes through the collection pipe, is stretched between the first collection roller (9), G2, is sandwiched between the collection belt flashing and the collection roller, and advances to the collection sheath shaft. The wire electrode (2) is drawn in a circle and discarded as shown in the figure, and the wire t pole (
The feeding speed of 2) is variable by the rotation of a motor with a reduction gear attached to the back of the collection roller (goods), and the collection roller (goods) and the lower roller decoy are conveyed by a belt on the back side. Moreover, since both of the rollers mentioned above, ■ have the same diameter, they rotate synchronously. Therefore, the wire electrode (2) is pulled without slipping due to the frictional force of the four lower rollers and the bending of the collection roller (B), and is collected onto the collection sheath shaft.

The insertion operation of passing the wire electrode through the hole and the lower die side will be explained. Here, the wire electrode (2 ) The state shown in FIG. 2(a) is the initial state of the wire insertion action. In other words, the upper die guide (A) and the machining start hole (C)
The lower tie guide frame is aligned vertically and is in a single state.Next, as shown in Fig. 2(b), lower the vibe guide αη and start the construction. Pass it through the hole and make the upper die guide face and the lower die guide face each other. The lower end of the upper taiskaite ridge in this state will be called the lower limit. This position is detected by the limit/soto sui-nochi, etc. As shown in Fig. 2 (C), the rotation of the wire feeding pinch roller (7) and the wire feeding presser roller (8) Due to the force, the wire electrode (2) begins to move between the two sides.Figure (C) shows the state where the wire electrode (2) has passed through the lower die guide (end). Figure 2(d) shows - After the wire electrode (2) reaches the collection box, the pipe guide αη rises to a fixed position and stops, and the power supply bin (2), (
7) The movable plate can with attached @ and the pressing plate with the movable plate (b) attached do not press against the pipe guide αη side and the insertion operation is completed and the state is 1.

Moreover, FIG. 8 shows a control circuit for the electromagnetic brake (101) attached to the play destination roller (3). In this FIG. 8, switching of the tension on the wire electrode (2) during processing is as follows: The electromagnetic brake (](+)) is controlled by switching the resistor group (10B) with the one-contact rotary switch (102) provided on the operation surface, and switching the resistor group (10B) with the transistor (10B). 104) and finally the electromagnetic brake (](1
By changing the current in 1), the T wire tension is set to suit the machining content.
The DC power supply for IIJ is a current limiting resistor.

10,000, during the wire electrode automatic supply, upon receiving the wire electrode automatic supply raw signal from the NO device (105), the relay RASK (106) is turned on, and the B contact of the relay ASlc causes the multi-contact rotation. The circuit of Sui Sochi (102) is disconnected, and on the other hand, the circuit of resistor C107) is connected by the A terminal of relay As1=, and the circuit of resistor C107) is connected.
The brake torque corresponds to the voltage determined by the resistor (108) and the wire electrode feeding force during automatic wire electrode supply (e). The tension exerted on the wire electrode (2) by the player torque of
subtracting the extremely low tension of less than 1 kink), it becomes a constant value of 1 k.

Since the conventional automatic wire feeder is configured as described above, the feeding pressure of the wire electrode during automatic wire electrode feeding is constant regardless of the type of wire electrode or the diameter of the wire. In some cases, if the wire diameter is too thick, the wire electrode will not pass smoothly through the lower die unless the wire electrode is sent out with a large force. If the feeding force is large, the wire will buckle even against the slightest resistance along the wire path, causing the wire electrode to protrude from the wire path.

[Summary of the invention]

This invention eliminates the missing door of the conventional one as mentioned above.
The wire electrode feeding force during wire electrode automatic supply is determined according to the type of wire electrode.
By switching the wire tension in multiple stages, the wire*
T! The object of the present invention is to provide an automatic wire electrode feeding device for a wire electrical discharge machining device that has a high success rate regardless of the type of lrI.

[Embodiments of the invention]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a simple embodiment of the present invention will be explained with reference to the drawings. Fourth
The figure shows the control circuit of the electromagnetic brake (] (J)) attached to the brake 1 fuller (3) as in Figure 3, and the same reference numerals as in Figure 31 indicate the same or equivalent parts.
In FIG. 4, when a piece of paper tape (109) containing information representing the type of wire electrode is input to the NO device (105), a plurality of relays (]10) are activated in accordance with the type of wire electrode. Turn on one of the circles and (110) glue 1
One of the group of resistors (111) is selected by the A contact of /-, and a current of 1゛ corresponding to the voltage determined by this resistor and the resistor (308) flows through the electromagnetic brake, generating a Fregit torque. If you change the information input to the NC% position (105) depending on the type of wire electrode,
According to that information, one brake torque can be obtained, and as mentioned above, the wire electrode feeding force by the pinch roller (7) during automatic wire electrode supply is ) subtracting the brake torque and the reversing torque of the wire supply reel (1) from the rotational torque gives a value of 1, so by changing the brake torque, the wire electrode feeding force can be changed. In the above embodiment, information representing the type of wire electrode is supplied to the NO device using a paper tape, but manual data entry may also be required, or the information indicating the type of wire electrode can be input to the NO device by a multi-contact switching switch Vch or IITr, regardless of the NO device. A similar effect can be obtained by using a resistor and changing the resistance value depending on the type of wire electrode.

[Effects of the Invention] As described above, according to the present invention, the wire feeding force during automatic wire electrode supply is switched to multiple stages of wire tension and breakage in accordance with the type of wire electrode. This eliminates problems such as protrusion of suitable T stiffness and insufficient wire electrode feeding force, significantly improves the success rate of automatic wire electrode supply, and greatly reduces the chance of the system stalling or tripping during unattended operation, increasing productivity. It has the effect of leading to an improvement in

[Brief explanation of the drawing]

FIG. 1 is a configuration diagram of a conventional wire electrode automatic feeding device, FIG. 2 is an explanatory diagram showing a conventional wire electrode insertion operation, and FIG.
This figure shows a conventional electromagnetic brake control circuit, and FIG. 4 shows an embodiment of the present invention. In the figure, (1) is the wire supply reel, (2) is the wire electrode, egg is the wire electrode collection box, and (c) is the machining start hole. In the figure, the same symbols indicate the same or equivalent parts. , Agent Masuo Oiwa (α) Figure 2 (cl) Procedural amendment (voluntary) Date 1, Showa 1999-088627 Patent application No. 59-088627 3 To Hitoshi Katayama, representative of the person making the amendment Section 4 Agent 1M'S 5, Subject of amendment (1) Detailed explanation column of the invention in the specification (21 Drawing 6 Contents of amendment (1) Meiji f JB declaration, page 4, line 3, "Arm ``For circuit use'' is corrected to ``for arm rotation.'' (In the same content of 21, in the 8th page, line 19, ``reverse torque'' is corrected to ``reverse torque.'') +31 In the drawing, Figures 1, 3, and 4 are corrected as shown in the attached sheet. 7. At least one copy of each of the revised drawings (Figures 1, 3, and 4) of the attached documents.

Claims (1)

[Claims] A wire electrode supplied from a wire supply reel is passed through a machining start hole of a workpiece, and the wire electrode is automatically fed. An automatic wire electrode feeding device for a wire electrical discharge machining device, comprising a device that switches the feeding force for feeding the wire electrode into a plurality of stages corresponding to the type of the wire electrode.