JPH03166017A - Wire-cutting electric discharge machine - Google Patents

Abstract

PURPOSE:To prevent a wire-cutting electric discharge machine from being damaged by an intermittent element which has not been removed to a proper position by continuing wire cutting process while making sure that an intermittent element to be removed is removed to a position at which the element does not disturb actuation of the wire-cutting electric discharge machine. CONSTITUTION:An intermittent element removing device 11 holds an intermittent element, carries the element to the opening 26 of an intermittent element storing device 18 and casts the element into the device 18. An intermittent element passage detecting sensor 27 generates a signal indicative of passage of the intermittent element through the opening 26. After that, an NC control device 6 detects the signal and then commands the next wire cutting process.

Description

DETAILED DESCRIPTION OF THE INVENTION FIELD OF INDUSTRIAL APPLICATION The present invention relates to a wire-cut electrical discharge machining apparatus with a core removal set-up.

Conventional technology wire cut release? :f 7,'il When a closed figure is cut out using the above device, a core having the outline of the figure is produced. If this core is left as it is, it will get in the way of the subsequent wire cutting process, so it is removed manually or by various core removal devices provided in the wire cut electrical discharge machining apparatus. However, because removal was not confirmed or because the removed core was left in the operating area of the upper wire guide, the upper wire guide and the lower wire guide were sometimes damaged during subsequent machining. Furthermore, if wire cutting processing that produces a core is to be performed continuously without an operator, it is necessary to completely remove the core.

Problems to be Solved by the Invention An object of the present invention is to provide a wire-cut electrical discharge machining device that operates by confirming the removal of a core.

Means for Solving the Problems A wire-cut electric discharge machining apparatus includes a core removing device and a core accommodating device.

The core accommodating device has a core passage detection sensor in the opening.

The opening is arranged in a region between a movable region of the upper wire guide and a movable neck region of the core holding section.

The output of the sensor is connected to a data input terminal of an NC control device that controls a wire-cut electrical discharge machine.

The working core removing device holds the core, transports it to the opening position of the core storage device, and inserts it.

The core passage detection sensor emits a signal that the core has passed (accommodated) the opening.

After confirming the above-mentioned signal, the NC control device instructs the next wire cutting process.

Embodiment FIG. 1 shows the entire wire-cut electric discharge machining apparatus 1, which includes a table section 2, a column 3, an upper arm 4, a lower arm 5, and an NC control device 6. On the table portion 2, a workpiece stand 7 is movable in X-axis and Y-axis directions set on a horizontal plane.

At the tip of the upper arm 4, an upper guide section 8 equipped with a U-drive device is provided so as to be movable up and down along two vertical axes, through which a wire 9 is pushed. Upper wire guide 10
A core removing device 11 is attached.

A lower wire guide 12 is provided at the tip of the lower arm 5 at a position facing the upper wire guide IO.

As shown in the figure, the wire 9 is passed from the supply reel 13 to each guide roller 14, tension roller 15, and upper wire guide 10. The wire passes through the lower arm 5 via the lower wire guide 12, reaches the feed roller 16, and is housed in the take-up roll 17.

Reference numeral 18 is a core accommodating device.

The core removing device 11 has a main body 19 as shown in Fig. 2.3.
, a rotating arm 20, a vacuum generator 21, and a support portion 22 at the tip of the lower nozzle 12.

The main body part 19 is fixedly attached to the upper guide part 8,
The base of the rotating arm 20 is supported by a horizontal shaft 23, and
A drive mechanism for the rotating arm 20 using an air actuator is provided inside.

The tip of the rotating arm 20 is bent into a hook shape, and four suction pads 24 as a core holding section are provided on the tip surface of the rotating arm 20 in close proximity to each other. Due to the hook-shaped bending, the suction pad 24 is attached to the rotating arm 2.
0 is rotated downward (Fig. 3), the upper wire guide 1
It can be located below 0.

Each suction pad 24 is made of synthetic resin with flexible elasticity and is connected to the vacuum generator 2 via a tube 25.
Connected to 1.

The support portion 22 in the lower wire guide 12 is formed by enlarging the periphery of the nozzle opening to form a surface parallel to the workpiece placement surface.

The core storage device 18 is a box-shaped container with an opening 26 and is removably disposed on the table portion 2 so as to move together with the table, and has a core passage detection sensor 27 around the opening 26 (a fourth figure).

The core passage detection sensor 27 is based on the principle of detecting the energy change that occurs in a magnetic field when an object passes through a magnetic field formed in an annular shape, or the energy change that occurs when an object passes through an optical path arranged in a planar manner. It is commercially available as a passing sensor. Such passing sensors are normally used for checking the passage of high-speed moving objects, counting small parts, etc.

The opening 26 is attached to the range where the upper wire guide 10 can move relative to the table part 2, that is, the movable area A of the upper wire guide 10, and is similarly attached to the upper guide part 8 and moves relative to the table part 2. Core holding part (suction pad 24
), and the output of the sensor 27 is connected to the data input terminal 28 of the NC control device 6 that controls the wire-cut electrical discharge machine.

The movable region A of the upper wire guide 10 is slightly larger than the machinable region by the wire 9 due to the dimensions of the nozzles and the like mounted surrounding the wire guide.

In FIGS. 2 and 3, the reference numeral 29 is an AWF mechanism, the reference numeral 30 is a workpiece, and the reference numeral 3 is a core.

During wire electrical discharge machining, the rotating arm l of the core removing device 11
9 is in the retracted position rotated upward as shown in FIG.

The wire cutting process progresses according to the wire cutting program provided in the NC control device 6, and when the core 31 is cut out, the core 31 is placed on the support portion 22 of the lower wire guide 12, and the NC control device 6 performs the process according to the program. The set core removal mode is set.

In this mode, the predetermined M code (
auxiliary functions) etc., the following operations are performed.

The discharge power source is cut off, and at the same time, the AWF mechanism 29 is activated to cut the wire 9, and the upper and lower wire guides 10.1
The wire is removed from between the two.

As the upper guide portion 8 is moved upward, the data input terminal 28 of the Nc control device 6 is opened to the core passage detection sensor 27. In addition, in the case of the example, the stroke of the Z axis is 300 mm.

When the upper guide section 8 reaches the upper limit position, the NC control device 6
The drive mechanism of the core removing device l1 is activated, the rotating arm 20 rotates downward, and the plurality of suction pads 24 arranged on the distal end surface are located at the lower part of the upper wire guide 10.

When the completion of the downward rotation of the rotating arm 2o is confirmed by the proximity switch, the upper guide portion 8 is lowered in that state, and the suction pad 24 comes into contact with the core 31 to attract and hold it.

The upper guide part 8 further descends about 2 mm from the above-mentioned contact position, firmly presses the suction pad 24 against the core 31, stops once, and then rises.

The core 31 is attracted to the suction pad 24 as it rises.
is pulled out from the workpiece 30 and further moved upward until the upper guide part 8 reaches the upper limit position and stops, and the workpiece 30
sufficient distance from the surface.

When it is confirmed that the upper guide part 8 has reached the upper limit position, the drive mechanism of the core removing device 1l is activated, and the rotating arm 20 is rotated upward together with the attracted core 31 about the horizontal shaft 23. do. This position is the retracted position of the rotating arm 20.

The workpiece stand 7 of the table 2 is moved on the X-axis and Y-axis planes,
The core 31 supported by the distal end surface of the rotating arm 20 is relatively conveyed to a position where it does not interfere with the movement of the workpiece 30, that is, to the position of the opening 26 of the core storage device 18 disposed in the area C. do. Then, the suction is released and the core 31 is dropped into that position.

When the falling core 31 passes through the opening 26 of the core storage device @8, the core passage detection sensor 2 provided in the opening 26
7 detects this and transmits a passing signal to the NC control device 6. This confirms that the core removal mode has ended.

Then, the NC control device 6 aligns the next machining start hole in the workpiece 30 with the wire position (the intersection of the line connecting the upper wire guide 10 and the lower wire guide 12 and the upper surface of the workpiece), and
The wire 9 is automatically connected by the WF mechanism 29, and the next wire cutting process is continued.

In the core removal mode, the core holding portion is in the opening 26.
If the core passage detection sensor 27 does not send a passing signal even though the core 31 has reached the position shown in FIG. An alarm will be raised if the item has been left unattended.

The operator confirms the removal of the core 31 only when there is an alarm.

The above is one example.

Since the core storage device 18 only needs to have its opening 26 in the region C, its form is not limited to the container as in the embodiment.
It may be in the form of a bag, or a form that leads from the opening 26 to another location with a slide slope.

The core passage detection sensor 27 is not limited to a passage sensor either.

It may also be a photoelectric switch, a contact switch, etc. disposed in a passageway connected from the opening 26.

The core removing device 11 is not limited to the above configuration, including the configuration of the core holding section. Therefore, the position and area of the region C can change depending on the movable range of the holding part.

Advantages of the Invention Since the wire cutting process is continued while confirming that the core to be removed has been removed to a position that does not interfere with the operation of the wire-cut electric discharge machine, it is possible to prevent the core from being removed in the appropriate position. The wire-cut electric discharge machine is not damaged, and a plurality of programmed cutting operations can be performed continuously without any operator.

[Brief explanation of the drawing]

1 is a perspective view, FIG. 2 is a front view, FIG. 3 is a partially sectional front view, FIG. 4 is a block diagram, and FIG. 5 is a diagram for explaining regions. 6... NC control device, 10... Upper wire guide, 11
... core removal device, 18 ... core accommodation device, 24.
...Suction pad (core holding part), 26...Opening, Fig. 1

Claims (1)

[Claims] It includes a core removing device and a core accommodating device, and the core accommodating device has a core passage detection sensor in an opening, and the opening is located between a movable region of the upper wire guide and a movable region of the core holding part. A wire-cut electric discharge machining apparatus characterized in that the output of the sensor is connected to a data input terminal of an NC control device that controls the wire-cut electric discharge machine.