JPH03256621A - Gripping device of pipe electrode - Google Patents

Abstract

PURPOSE:To surely grip a pipe electrode, by forming in a semi-circular arc the guide part which moves a pipe electrode with its guiding toward the gripping part of a clip base with the rotation together with an opening and closing member 2 with its provision at one end of the opening and closing member, and equipping the guide fitted with each centers of the opening and closing member and circular arc being made eccentric. CONSTITUTION:In the case of exchanging the used pipe electrode 12 bent with heat, action stress, etc., an arm 32 is advanced to the part of the electrode 12 by moving it to a bracket 29 by a motor by opening the clipper 43 of an opening and closing member 3, moved while abutting the electrode 12 to the circular arcuated face of a guide 46 and the arm 32 is stopped at the place coming into contact with the end face of a clip base 44. When the clipper 43 is closed by rotating the member 3 by the operation of a rod 40 by a motor 41, the electrode 12 is moved toward the grip part of the base 44 with the circular arcuated face of the guide 46, which is rotated together with the member 3 as shown by b c -d e f of the figure and the electrode 12 is gripped by the clipper 43 and the gripping part of the base 44 at the place reaching the grip part of the base 44.

Description

[Detailed Description of the Invention] [Industrial Application Field] A start hole machining device for inserting a wire electrode into a workpiece in a wire-cut electrical discharge machining device that performs electrical discharge machining on a workpiece using a wire electrode. The present invention relates to a pipe electrode grasping device in an automatic pipe electrode exchange device for start hole machining provided in the start hole machining device.

[Conventional technology]

Conventionally, a wire electrode for processing a workpiece, a reel for storing the wire electrode, a feed roller that draws out the wire electrode from the reel and sends out the drawn wire electrode, and a pipe electrode for drilling a start hole in the workpiece. a chuck for supporting the pipe electrode; a cutting device for cutting the wire electrode between one surface of the workpiece and the feed roller; and a head that includes the feed roller and the chuck and moves in the vertical direction. , a wire-cut electric discharge machining device having a column equipped with a pipe machining shaft that supports the head so as to be movable in the vertical direction, and a ram etc. that supports the pipe machining shaft and moves in the vertical direction. A bracket provided on the column, a case holding a plurality of pipe electrodes provided on the bracket, an arm supported so as to be movable in a uniaxial direction horizontal to the bracket, and a case fixed to the tip of the arm. A clip stand 44 having a grip part for supporting the pipe electrode shown in FIG. 3, and a clipper 4 that rotates around a shaft 33 provided on the clip stand 44 and grips the pipe electrode 12 with the clip stand 44.
When replacing the used pipe electrode 12 attached to the chuck 15, which has an opening/closing member 3, which may be an opening/closing claw having an opening/closing claw, and has a start hole for passing the wire electrode 1 through the workpiece 25, As shown in FIG. 6, a clip stand 44,
The opening/closing member was grabbed by clipping it with the clipper 43 of the wind 3, and then pulled out and replaced.

[Problem to be solved by the invention]

Therefore, the used pipe electrode I is attached with the chuck 15 after being used for drilling one or more start holes in the workpiece.
No. 2 is thin (usually with a cross-sectional diameter of about 2 to 3 mm) and long (for example, about 150 to 400 mm), so it is susceptible to the effects of heat, machining pressure, and machining fluid pressure during start hole machining. Due to stress, etc., there are many cases where eccentricity or curvature has occurred at the tip of the pipe electrode, for example, by several millimeters. When the pipe electrode 12 is clamped and gripped by the ripper 43 and the clip stand 44, the gripping positions of the pipe electrode 12, the clipper 43, and the clip stand 44 are shifted, and it is often impossible to grip the pipe electrode 12. The present invention has been made with the object of eliminating these drawbacks and providing a gripping device that can grip the pipe electrode 12 reliably.

[Means to solve the problem]

The pipe electrode grasping device of the present invention that achieves the above-mentioned object includes a bracket provided on a column of a wire-cut electric discharge machining device, and a device provided on the bracket preferably in the Y-axis direction, etc.
A case that holds a plurality of pipe electrodes aligned in the axial direction, an arm supported so as to be movable in a uniaxial direction horizontal to the bracket, and a grip part that supports the pipe electrode fixed to the tip of this arm. an opening/closing member 3 having a clip base and a clipper that rotates around an axis provided on the clip base and grips a pipe electrode with the clip base;
The guide portion provided at one end of the opening/closing member 3 and rotating together with the opening/closing member to guide and move the pipe electrode toward the gripping portion of the clip base is a semicircular arc, and the guide portion of the opening/closing member 3 A guide is provided which is attached eccentrically to the center of rotation and the center of the circular arc.

[For production]

When replacing a used pipe electrode 12 that has become eccentric or bent due to heat, impact, or stress during processing, open the clipper 43 of the opening/closing member 3, and align the pipe electrode 12 toward the axis of the pipe electrode. Move the arm forward from a direction approximately perpendicular to the guide 4.
While the side part of the pipe electrode is brought into contact with the circular arc surface of 6, the arm is stopped at a place where it comes into contact with the end surface of the clip stand 44. Then, as the clipper 43 is closed, the arcuate surface of the guide 46 rotating together with the opening/closing member 3 guides and moves the pipe electrode toward the grasping part of the clip base, and when it reaches the grasping part of the clip base, the clipper The pipe electrode is clamped and grasped by the grasping part of the clip stand. This grasped position is set so that the axis of the pipe electrode and the axis of the chuck coincide, so from then on, raise the ram, pull out the pipe electrode from the chuck, and operate the arm to release the grasping part. The clipper 43 of the opening/closing member 3 is attached to the collection box that has been moved or rotated.
Open it and release the pipe electrode by dropping it.

〔Example〕

The present invention will be explained based on the drawings that illustrate the invention.

As shown in FIG. 1, the wire-cut electrical discharge machining apparatus according to the present invention applies back tension to a wire electrode 1 and feeds it out from a reel 6 provided at the top of a column 5 provided on a bed 4. Then, the wire electrode 1 is pulled out from the reel 6, and a tension roller 9 is driven by a motor 8 so that tension is generated in the wire electrode 1 by the take-up roller 7. There is also a feed roller 10 provided for feeding during automatic insertion of the paper. A pair of feed rollers IO consisting of a capstan or a brake roller and a pinch roller, etc., which feed the wire electrode 1 between them, are driven by a motor 11, which is connected to the motor 11 by a one-way clutch (not shown). , the wire electrode 1 is fed toward the pipe electrode 12, but when the wire electrode 1 is pulled and moved by the winding roller 7 during wire cut electrical discharge machining, it may idle or the pinch roller may separate and pinch the wire electrode 1. It is designed not to be worn. When cutting with the cutting device 13, the feed roller 10 can be braked instantaneously or for a predetermined time using a brake 14 operated by a solenoid or the like. The chuck 15 provided to support the pipe electrode 12 is attached to a cap nut 48 which is removably screwed onto the flange 47, and is removably fitted into a recess of the cap nut 48, and is then connected to a tacholet chuck 49. , a hard rubber packing 50 that covers this collet chuck 49 and has a conical portion on the outside; and this rubber packing 50.
The collet chuck 49 has a conical recess that fits into the conical portion of the collet chuck 49, and a piston 51 that moves within the flange 47 to tighten or loosen the collet chuck 49 via a rubber packing 50. The head 16 equipped with the chuck 15 and the like is supported on a pipe processing shaft 17, and is moved in the vertical direction by a screw (not shown). In addition, this pipe processing axis 17 has a U axis (X axis) and a v axis that are perpendicular to each other on a horizontal plane.
It is supported by a UV table 18 that moves in the axial (Y-axis) direction, and this UV table 18 is supported by a ram 19 that is supported by the column 5 and moves in the vertical direction. Although not shown in the upper nozzle 21 attached to the shaft 2G fixed to the UV table 18, an energizing pin for energizing the wire electrode 1 and an upper positioning guide for the wire electrode 1 that opens and closes using hydraulic pressure are housed. A sensor 23 that detects when the tip of the pipe electrode 12 comes into contact is provided at a position a predetermined horizontal distance from the center of the lower nozzle 22 provided opposite to the upper nozzle 21. The lower arm 24 supporting the nozzle 22 is provided with the aforementioned winding roller 7. The workpiece 25 facing the wire electrode 1 is attached to a processing table 26, and the processing table 26 is attached to a table 2 which moves in the X-axis and Y-axis directions perpendicular to each other. the table cover 28
surrounding. An arm 32 is supported by a bracket 29 provided at an appropriate position on the column 5 of such a wire-cut electric discharge machining apparatus so as to be movable in a horizontal direction and in a direction passing through the axis of the pipe electrode 12. The movement is
This is accomplished by rotating a rack (not shown) attached to the arm 32 and a pinion that engages with the rack by a motor (also not shown) fixed to the bracket 29. A fixing claw 2 having a flat gripping surface 34 for supporting the wire electrode 1 is fixed to the tip of the arm 32, and a shaft 33 is attached to a clip base 44 at the tip of the arm 32 opposite thereto. A flat gripping surface 35 for gripping the wire electrode with the fixed claw 2, and a shaft in a direction substantially perpendicular to the axis of the wire electrode 1 at a position approaching the edge of the fixed claw 2. A stepped portion 37 (FIG. 9b) is formed by welding a hard wire 36 having a core and having a diameter of about 1 to 3.0 mm (FIG. 9a) or by cutting and forming in advance.
The device includes an opening/closing member 3 that also serves as an opening/closing claw and has a protrusion formed thereon, and an opening/closing device for opening/closing the opening/closing claw 3. This opening/closing device includes a joint 39 that fits into a shaft 38 provided at the end of the opening/closing claw 3, a rod 40 connected to this joint 39, a motor 41 that moves this rod 40 in the direction of arrow B-C, and this motor. 41 and arm 3
It consists of a case 42 fixed to 2.

When the pipe electrode 12 is worn out, it is replaced with a spare pipe electrode 12.
As shown in FIG. 3, a case 30 is attached to a bracket 29 fixed to the upper part of the column 5, and a large number of pipe electrodes 12 are accommodated therein in the Y-axis direction, and the bushing 3I is pushed by a spring (not shown). That's what I do.

An arm 32 supported by the bracket 29 so as to be movable in the horizontal X-axis direction, a clip stand 44 fixed to the tip of this arm 32, and this clip stand 44
An opening/closing member 3 that rotates around a shaft 33 provided in the clip base 44 and has a flat ripper 43 that grips the pipe electrode 12 with the clip base 44 and also serves as an opening/closing claw; As shown in FIG. 8, at one end of this opening/closing member 3,
The guide surface that rotates together with the opening/closing member 3 and moves the pipe electrode 12 toward the gripping portion of the clip base 44 is a semicircular arc, and the center of rotation of the opening/closing member 3 is located between the arc of the guide surface. A guide 46 is provided eccentrically from the center. When using this pipe electrode 12 gripping device to replace a used pipe electrode I2 that is bent due to heat or applied stress, open the clipper 43 of the opening/closing member 3, and use the motor (not shown) to hold the arm against the bracket 29. 32 and advance it to the part of the pipe electrode 12, move the pipe electrode while touching the arcuate surface of the guide 46 as shown in FIG. do. When the clipper 43 is closed by rotating the opening/closing member 3 by operating the rod 4I by the motor 41, the arcuate surface of the guide 46 rotating together with the opening/closing claw 3, as shown in FIG. 8b+c-+d-+64f, Pipe electrode 1
2 is moved toward the grasping part of the clip stand 44, and when it reaches the grasping part of the clip stand 44, the pipe electrode 12 is grasped by the clipper 43 and the grasping part of the clip stand 44. Although the guide 46 is provided below the opening/closing member 3,
In Figure 8, the explanation is given with diagonal lines placed above it for easy understanding. Pipe electrode 1 grasped at this grasped position
2, that is, the gripping axis of the pipe electrode 12 by the clip base 44 and crimp bar 43 is set so that the axis of the chuck 15 coincides with that of the ram 19.
and pull out the pipe electrode 12 from the chuck 15.
The arm 32 is operated to move the grasping section or the pipe electrode 12 is discharged into the rotating collection box 45. Then, the arm 32 is moved back in the direction of arrow C, and the clipper 43 is operated to grasp the spare pipe electrode 12 pushed out from the case 30 with the clip stand 44, and the arm 32
move the head forward to bring it below the chuck 15, lower the head 16, and attach a new pipe electrode 1 to the chuck 15.
2, the pipe electrode 12 is replaced with a new pipe electrode 12.

When inserting the wire electrode 1 into the pipe electrode 12, it is sufficient to send it out using the feed roller 10.

Therefore, to explain the cutting operation of the wire electrode, firstly, when cutting the wire electrode 1, there are cases in which the pipe electrode I2 is attached to the chuck I5 and used, and cases in which the pipe electrode I2 is not attached. There are cases where the wire electrode 1 is used in the process, and cases where the wire electrode 1 is removed when cutting the wire electrode 1.

When it is necessary to cut the wire electrode 1, the wire electrode 1 is stretched between the upper and lower nozzles 2], 22 or the positioning guide, or the wire electrode 10 is suspended from being updated. At the end of electric discharge machining, when automatically inserting the wire electrode 1 for the next machining, or when preparing to start machining, or for automatically inserting the wire electrode 1, cut the tip of the wire electrode 1 and insert it. There are cases where you want to align the tips of the wire electrodes 1 for
In any case, the running wire electrode l stops updating,
When preparing to insert the wire electrode 1 or trimming the tip due to automatic insertion failure, the wire electrode 1 fed by a predetermined amount by the feed roller 10 is held down by the brake 14 or opened and closed by a pair of electromagnets (not shown). In this case, if the pipe electrode 12 is attached, the processing head 16 is raised along the pipe processing axis 17, and the arm 3
2 is sent out to the bracket 29 in the direction of arrow B by a motor (not shown), and positioned forward so that the tip end claw of the grasping device, which consists of a fixing and opening/closing claw, comes to the running position of the wire electrode 1 outside the tip of the pipe electrode 12. , then move the rod 40 in the direction of arrow B to open the opening/closing claw 3 and open the arm 3.
Adjust by moving 2 forward, etc. Then, when the wire electrode 1 comes between the opened opening/closing claw 3 and the fixed claw 2, move the rod 40 in the direction of arrow C to close both claws, and the processing head 1
6 or after raising the ram 19 and stretching the wire electrode 1,
The tip of the wire electrode 1 is adjusted by cutting with the cutting device 13. Then, the wire electrode 1 is inserted into the pipe electrode 12 while gripping each other by reciprocating the feed roller 10 or one of the grasping claws that are opened and closed by the pair of electromagnets (not shown) in the vertical direction. done by

In the above case, the wire electrode grasping device side can be lowered to apply tension when cutting the wire electrode 1, and the fixing/opening/closing relationship between the fixed claw 2 and the opening/closing claw 3,
Alternatively, the manner in which the protrusions formed on the gripping surface are formed or provided may be reversed from the illustrated and described embodiments.

〔Effect of the invention〕

According to the present invention, when replacing a used pipe electrode that has been bent due to heat or applied stress during start processing, the clipper of the opening/closing member is opened, and the arm that holds the clipper for gripping the wire electrode and the clip stand is opened. The arm is moved forward, the side surface of the pipe electrode is brought into contact with the arcuate side surface of the semicircular guide, and the arm is stopped when the pipe electrode comes into contact with the end surface of the clip stand. Then, as the clipper is closed, the pipe electrode is moved along with the opening/closing member by the circular arc surface of the rotating guide toward the grasping part of the clip base, and when it reaches the grasping part of the clip base, the clipper and the clip base are moved together. Since the pipe electrode is grasped with the grasping part, it is now possible to grasp the pipe electrode reliably. 4,

[Brief explanation of drawings]

FIG. 1 is a diagram of a wire-cut electrical discharge machining apparatus equipped with a pipe electrode gripping device of the present invention, and FIG. 2 is an enlarged partial sectional view of the pipe electrode gripping portion and chuck in FIG. 3 is a diagram showing an embodiment of the present invention of a wire electrode grasping claw and a pipe electrode grasping device, FIG. 4 is a partial diagram of an embodiment in which the guide of the present invention is attached as seen from the direction of arrow A in FIG. 3, and FIG. 3
A partial embodiment configuration diagram with the fixing claws removed, FIG. 6a,
Fig. 7 shows a partial view of an embodiment of the present invention, and Fig. 8 a, b, c, d, e, and f show the present invention. FIG. 9a is an explanatory diagram showing the grasping process according to the embodiment. b is a diagram illustrating a fixed claw and an opening/closing claw that sandwich a wire electrode; 1......Wire electrode 2...
...Fixing claw 3...Opening/closing member 12...Pipe electrode 15...
・・・・・・・・・Chuck 29・・・・・・・・・・・・
・Bracket 30...Case 31...Button 32...
......Arm 43... Clipper 44...
・・・・・・Clip stand diagram 1

Claims (2)

[Claims] (1) A wire electrode for processing a workpiece, a reel for storing this wire electrode, a feed roller that draws out the wire electrode from this reel and sends out the drawn wire electrode,
A pipe electrode for machining a start hole in a workpiece, a chuck for supporting this pipe electrode, a head for moving this chuck in the vertical direction, and a pipe machining that supports this head so that it can be moved in the vertical direction. In a wire-cut electrical discharge machining device that has a column equipped with a shaft and a ram etc. that supports this pipe machining shaft and moves in the vertical direction, a bracket provided on the column and a plurality of pipe electrodes provided on this bracket are used. A holding case, an arm supported so as to be movable in a direction horizontal to the bracket and substantially orthogonal to the axis of the chuck supporting pipe electrode, and a gripping part for supporting the pipe electrode fixed to the tip of the arm. an opening/closing member having a clipper that rotates around an axis provided on the clip base and grips a pipe electrode with the clip base; and an opening/closing member that rotates together with the opening/closing member provided at one end of the opening/closing member. A pipe electrode gripping device comprising: a guide for moving the pipe electrode toward the gripping portion of the clip base. (2) The pipe electrode grasping device according to claim 1, wherein the guide has a semicircular arc and is mounted eccentrically with respect to the center of rotation of the opening/closing member and the center of the arc.