JPS6348651B2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention uses electrodes with a required processing shape, simple electrodes such as wires and rods, electrodes with wires strung between guides, etc. to perform electrical discharge, discharge electrolysis, electrolysis, etc. by energization. The present invention relates to an improvement of the supporting device for the processing electrode in electrical processing in which a workpiece is carved, drilled, cut, three-dimensionally processed, wire cut, etc. by processing action.

The machining electrode is used at the beginning of machining, when the electrode wears out, or when it is selected according to the shape of the machining part.
However, each time the electrode is replaced, the electrode falls down and needs to be corrected to ensure that it is correctly fixed vertically.
Previously, it was necessary to tighten and loosen the bolts of the electrode chuck and to ensure vertical accuracy, making it troublesome to correct the inclination.

The present invention improves on this point by using a magnetic chuck to tiltably support the electrode support shaft when not energized, and after vertically clamping the electrode attached to the support shaft, the coil is energized. Therefore, the support shaft is fixed.

The present invention will be explained below by way of an example. FIG. 1 is a side sectional view of the whole, and FIG. 2 is a top sectional view of the pressure clamp. Reference numeral 1 denotes a machining head, and a motor 2 provides vertical Z-axis feed, a motor 3 provides left-right feed on a plane orthogonal to the Z-axis, and other motors (not shown) provide back-and-forth feed in the front and back directions of the paper. Given. Reference numeral 4 denotes an electrode support shaft with a spherical head, which is surrounded by the processing head 1.
A support shaft surrounding member 5 is provided which is fixed to the support shaft.

The member 5 is made of a non-magnetic material and is fixed to the head 1. Reference numeral 6 denotes magnetic powder filled in the fitting gap, and a bearing 7 of a device for preventing the magnetic powder from flowing out is fitted into the gap. 8 is an excitation coil, and 9 is a bearing of a device that holds the center of the spherical portion of the support shaft 4 at a predetermined position and supports the support shaft so as to be tiltable about the center of the spherical portion.
This bearing 9 holds the center of the spherical head portion of the support shaft 4 at a predetermined position, and the support shaft 4
is supported so as to be tiltable as the center. Reference numeral 10 denotes an electrode chuck of a device for fixedly supporting a machining electrode 11 that is insulated and fixed to the support shaft 4, and the machining electrode 11 is attached and fixed to this by screwing, magnetic attraction, or the like. 12 is a processing clamp that applies pressure to the X-axis on a plane perpendicular to the Z-axis of the processing head; 13 is a pressure clamp that applies pressure to the X'-axis opposite to the X-axis;
125, 1 consisting of tip processing plates 121, 131, pressure springs 122, 132, feed screws 123, 133, and drive motors 124, 134.
Reference numeral 35 denotes a contact sensor, which applies a voltage between it and the electrode 11, and detects a voltage drop caused by contact, a flowing current, etc. as a signal.

Although pressure clamps are not shown, they are similarly provided on the Y and Y' axes in the front and back directions of the paper as shown in FIG. And each pressure plate 121, 131, 14
1,151 all have a comb-shaped cut at the tip,
The configuration is such that they can cross each other and come into contact at the center point O. In addition, each plate 121, 1 as shown in FIG.
31, 141, 151 are provided with stoppers 126, 136, 146, 156 to prevent them from falling off the main body, and springs 122, 132, 142, 15
2, the protruding length is always constant, and each spring is configured to apply equal spring pressure.

The electrode 11 attached to the chuck 10 can be freely tilted with a small force by de-energizing the coil 8. Therefore, by driving the motors 124 and 134, the pressure clamps 12 and 13 are moved from their respective positions to the electrode 1.
Slide the required distance toward 1. When the tip ends 121, 131 come into contact with the electrode 11 by this close feeding, the contact is confirmed by the signals of the sensors 125, 135, and the electrode contact of the plates 121, 131 of the opposing axes X, X' is confirmed. After that, each axis is further pressurized and fed a predetermined distance from there and stopped. This pressure feeding distance is preset according to the size, shape, etc. of the electrode 11 so that vertical clamping is always possible. In this state, the springs 122 and 132 are compressed by applying equal feed for a predetermined distance after the shaft end plates 121 and 131 come into contact with the electrode 11.
Apply a pressure equal to 1,131. Y-axis and
Similarly, each plate 141, 151 in the Y' axis direction.
A pressure equal to .

At this time, in the magnetic chuck, the coil 8 is not energized, the magnetic powder particles 6 filled between the support shaft 4 and the support shaft 4 are free to flow, and the support shaft 4 and electrode 11 are supported in a state where they can freely tilt. , each pressure plate 121,1 sandwiching this center electrode 11.
31, 141, 151 are cross X, X', Y,
Press with equal pressure from each Y′ axis direction, and clamp when the pressure is balanced. This pressure balance is achieved by counteracting the elastic pressures of equal springs on each axis, so that the electrode 11 can be clamped vertically. The electrode 11 is supported in a free state in advance and is tilted, so even if the feeding distance from the contact point of each pressure clamp 12, 13, 14, 15 is different, the compressed length is ultimately determined from each direction. Since the compressor is compressed by applying spring pressure with little pressure change in response to changes in the pressure, it is possible to apply pressure with almost no difference on each axis, and it is possible to clamp vertically in a balanced manner. When a strong magnetic field is generated by exciting the excitation coil 8 of the magnetic chuck in this clamped state, the magnetic particles 6 are fixed to each other, and the head of the support shaft 4 is fixed by attraction.
A support shaft 4 is fixedly supported on the head 1. This fixed support allows smooth fixed support without applying unnecessary external force, and allows the vertical clamp to be accurately fixed without interfering with the vertical clamp state, allowing for stable completion of the work of correcting the fall. can. Third
In the figure, pressure clamps 16, 17, and 18 are provided on the U-axis, V-axis, and W-axis in three directions relative to the center, and each tip plate 161, 171, and 181 is attached to a spring 16.
2, 172, and 182 are applied with equal pressure to balance and clamp the center. The center electrode can be clamped vertically by applying equal pressure from at least these three directions, and can be supported vertically by correcting its inclination.

FIG. 4 is a diagram showing the guide 22 of the wire electrode 21 used in wire cut electric discharge machining attached to the chuck 10 of a device for fixedly supporting the current-carrying machining electrode.
Since the configuration other than 2 is the same as shown in Figure 1,
The same reference numerals are used to omit the explanation.

An automatic electrode exchange device is installed for machining electrodes during electrical machining, and machining progresses sequentially while selecting and replacing electrodes from a stored group of electrodes each time the electrode wears out or in response to changes in machining shape or machining part. However, when exchanging the electrodes, the excitation coil 8
When the excitation is turned off, each magnetic powder 6 becomes free and the support shaft 4 becomes freely tiltable, making it easy to correct the inclination of the replacement electrode.By using the chuck 10 of the automatic replacement electrode as a magnetic chuck, Therefore, processing can be carried out continuously and stably under automatic control such as program control or computer control.

Incidentally, if a liquid lubricant is mixed with the magnetic powder 6 of the magnetic chuck to improve the fluidity of the magnetic powder, the operation of correcting the inclination of the electrode can be carried out more smoothly.

Various types of vertical clamping of the electrodes can be used, such as clamping by a material handling device other than the above-mentioned embodiments, clamping by pressing against a reference surface, and manual clamping.

[Brief explanation of the drawing]

Fig. 1 is a side sectional view of one embodiment of the present invention, Fig. 2 is a partial top sectional view thereof, Fig. 3 is a partial top sectional view of a case where pressure clamps are provided in three directions, and Fig. 4 is a partial top sectional view of the embodiment. It is another Example figure. DESCRIPTION OF SYMBOLS 1... Processing head, 4... Support shaft, 5... Fitting member, 6... Magnetic powder, 8... Magnetic coil, 1
1... Electrode, 11, 13... Pressure clamp.

Claims (1)

[Claims] 1. A support shaft having a device for fixing and supporting an energized electrode at one end and a spherical end at the other end; a support shaft surrounding member that surrounds the spherical portion at the other end and is fixedly disposed on the processing head; a tiltable support device; a magnetic powder filling a gap between the support shaft and the surrounding member; and a device preventing the magnetic powder from flowing out from the gap;
An energized processing electrode support device comprising a magnetic coil provided in the surrounding member and a power source that excites the magnetic coil.