JPS5919635A - Wire-cut electric discharge machine - Google Patents

Abstract

PURPOSE:To function a contact detector completely by constructing such that the electrode wire will not contact with the detector. CONSTITUTION:An electrode wire 7 has one end held by a supporting arm 9 secured to the body in order to penetrate through a workpiece 6 and led near to the workpiece 6. In this machine the detection board 20 is constructed into L-shape where the entire face except the actual contact portion or one end face of the contact detection face 21 is formed with insulator (for example, insulation coating). The contact detection of the detection board 20 with an auxiliary supporting table 4 positioned freely in the table can be performed only through the detection face 21. A flexible insulation board 22 for preventing contact between the wire 7 and the board 20 is arranged at upper position of the supporting arm 9 with which the detection board 20 will engage through a supporting section 13. Consequently the contact detector can be functioned completely.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention 1. r Wire-cut electric discharge machining equipment, in particular, the support arm that guides the electrode wire to the vicinity of the workpiece is a support stand for the workpiece,
The present invention relates to an improved wire-cut electric discharge machining device with a contact sensor capable of quickly detecting one part that comes into contact with another to prevent damage to the equipment.

Normally, the workpiece is loaded on a table installed in a processing tank, and a fixed support stand and an auxiliary support stand whose positions are variable are provided to suit the shape, form, and weight of the workpiece. The electrode wire that runs through the object is supported by wire guides provided above and below the workpiece.

The electrode wire is led at least one end into the vicinity of the workpiece by a support arm extending to one side of the workpiece, usually below.

Therefore, in general electric discharge machining equipment, the support arm that guides one end of the electrode wire is moved only between the support stands of the workpiece, especially when an auxiliary support stand is provided depending on the machining shape of the workpiece. In this case, the movable space changes, and unexpected contact between the support arm and the auxiliary support for the workpiece is likely to occur, resulting in damage to the support arm or loss of machine accuracy due to contact. For this reason, conventionally, there has been a detection device that detects contact between the support arm and an auxiliary support stand on which the workpiece is loaded, or other machine parts. If the support arm containing this detection device were to come into contact with an auxiliary support stand installed at any position within the table, a contact command/electrical signal would be issued and the entire can dispensing device would be stopped.

However, in general, when processing a workpiece, processing conditions such as electrical conditions and workpiece movement speed are selected, but if these processing conditions are not suitable for the workpiece, 1. It is common for the electrode wire to break during processing.

In this case, the length of the electrode wire that is sufficient for connection is drawn out from the reworked cable 4 from the chemical pole bobbin, and the wire is passed through the upper and lower nozzles that hold the wire.
．． 1 wire is optionally located. If this first electrode wire were to come into contact with the above-mentioned detection device, the support arm and auxiliary support stand would interfere, detecting an electrical signal in the same way as the first contact, and affecting the operation of the entire machine. One hot.

In view of the above-mentioned drawbacks, the present invention attempts to provide a device that does not interfere with the operation of mechanical devices, taking into consideration the possibility that the electrode wire may come into contact with the detection device.

Hereinafter, one embodiment of the present invention will be described based on FIGS. 1 to 6.

Two tanks (2) are installed on the moving table (1) made of a predetermined No. 4) is fixed.The table (5) is fixed by the fixed support base (3).
is fixed, and the workpiece (6) is loaded and fixed on the table (5). Perform electrical discharge machining with the workpiece (6)
The electrode wire (7) penetrates the workpiece (6) by 1°.
one end of which is fixed to the main body (8) and held by a supporting arm (9).
The support arm (9) is provided with two guide rollers 00 and a wire kite 01), and the support arm (9) is provided with two guide rollers 00 and a wire kite 01). and wire force, id 0]) to the processing section, where it is wound onto a take-up reel (shown at 1).

The support arm (9) is provided with a contact sensor, and this (7)
) The contact sensor includes a detection plate (2), has an electrical contact made of a good electrical conductor, and is insulated and supported on a support part (9) by a support part 03 of 7.2@. This supporting portion G has a built-in buffer material such as a spring (f not shown), and pressure is applied from the outside through two detection plates θ.

FIG. 8 does not show an electric circuit in one embodiment, and the detection plate O
2 is connected to the anode of the power source 0Q through a relay α1zr at λ1. The cathode of the power supply 0υ is connected to the auxiliary support (4) via the electrical line a*i-.

In Fig. 3, the chain line α force represents the detection plate 02 and the auxiliary support stand (4).
), and the supporting arm (9) moves relative to the moving table (1) by the feeding action of the device 7, j11.
Immediately before the accident occurred, the support arm (9) and the auxiliary support stand (4),! : The detection plate (
2) comes into contact with the auxiliary support stand (4), and the conductive path 0η shown by the chain line in FIG. ) and the auxiliary support base (4) can be prevented from occurring due to contact between the electrode wire (4).
7) one end contacts the detection plate O2 (71: case 14, third
Temporarily apply EF to the detection plate (a) or auxiliary support stand (4) in the figure.
Similar to the contact tube γ condition, fζ conductive path αη is closed at J.
If relay 0 operates, it will affect the operation of the Siegen circuit in processing section 11.

The present invention solves the above-mentioned drawbacks of the conventional technology.''4-\Significant improvements have been made and additional examples are not shown.

In other words, according to FIG. 5, the structure of the detection plate instead of the conventional detection plate a+ζ is L-shaped, and the entire surface except for the part where contact is actually detected and one end face of the contact detection surface 3υ is insulated (for example, treated with insulation). It is formed at. 1. Every time the detection plate (E) detects contact with the auxiliary support stand (4) located arbitrarily within the table. t, contact detection surface 3υ only and other parts cannot. In addition, at the upper position of the support arm (9) where the contact detection plate (1) engages through the support part 03, a wl electrode wire 7) is attached to the detection plate with a contact prevention mechanism and a flexible (for example, molded) By installing an insulating plate (rubber plate), the addition of these structures prevents the electrode wire (7) from coming into direct contact with the detection plate (a) as in the past. The flexible insulating plate (A) prevents the electrode wires (7) placed anywhere below the top of the machine from directly contacting the detection plate (4). Except for the actual contact detection surface 1), 4) is made entirely of insulator to minimize contact with the electrode wire (7).

Furthermore, in Figs. 5 and 6, the insulating plate (A) protrudes beyond the contact detection surface Qυ, and the electrode wire (7) contacts the insulating plate (A) from the upper direction of the machine. There is no contact with the contact detection surface 121), which prevents inconveniences related to machine operation that occur during machining when the electrode wire (7) directly contacts the detection plate 02 in the conventional equipment shown in Figs. 3 and 4. It is possible to do 91 things.

Note that when the detection plate (1) comes into contact with the auxiliary support base (4), the insulating plate is flexible and will not cause any trouble.

As explained above, according to the present invention, by making improvements to the conventional structure, it is possible to operate the contact detection device completely without any trouble.

[Brief explanation of drawings]

FIG. 1 is a plan view of a conventional wired electrical discharge machining apparatus according to the present invention, and FIG. 2 is a sectional view taken along the line ■-U in FIG. 1.
Fig. 8 is a structural diagram showing the electric circuit of the contact sensor, Fig. 4 is a plan view of the main parts of the contact sensor of the conventional device, Fig. 5 is a cross-sectional view of the conventional device shown in Fig. 8, which has been improved. Figure 6 (Fig. 5
It is a principal part top view of the contact sensor in a figure, and is a partial view. In each figure, the same reference numerals indicate the same or equivalent parts.
(6) is the workpiece, (7) is the electrode wire, (9) is the support arm, 0 (e) is the detection plate, 04) is the relay, and (a) is the insulating plate. Agent Shin Kuzuno - Figure 1, Figure 2, Figure 3, Figure 4, Figure 5, Figure 6, Figure 1, Indication of the case, Patent Application No. 128728/1982.
, Title of the invention: Waika, Soto electrical discharge machining device 3,
Person making the amendment (2) Contents of drawing 6, m (1) In the specification, page 2, lines 18 to 19 (this
(2) In the same book, on page 3, lines 13 to 14, correct the phrase "electrode wire" to "one electrode wire." 3) In the drawings, Figure 1 will be corrected as shown in the attached sheet. 7. List of attached documents (1) Corrected drawings (Figure 1) One or more copies of Figure 1

Claims (1)

[Claims] In a wire cutter electric discharge machining apparatus in which one end of an electrode wire that runs through a workpiece is guided near the workpiece by a support arm, a contact sensor including an electric contact is provided on the support arm, and the contact sensor A wire-cut electrical discharge machining device equipped with a flexible protection device and characterized by: