JP2813594B2 - Pipe electrode grasping device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] In a wire cut electric discharge machine for electric discharge machining of a workpiece using a wire electrode, a start hole machining apparatus for inserting a wire electrode through the workpiece. The present invention relates to an apparatus for grasping a pipe electrode in an automatic exchange apparatus for a pipe electrode for starting hole processing provided in the start hole processing apparatus.

[Conventional technology]

Conventionally, a wire electrode for processing a workpiece, a reel for storing the wire electrode, a feed roller for extracting the wire electrode from the reel and sending out the extracted wire electrode, and a pipe electrode for processing a start hole in the workpiece. A chuck that supports the pipe electrode, a cutting device that is located between one surface of the workpiece and the feed roller and cuts the wire electrode, and a head that includes the feed roller and the chuck and moves vertically. In a wire-cut electric discharge machine having a column having a pipe machining shaft for supporting the head so as to be able to move in the vertical direction, and a ram or the like for supporting the pipe machining shaft and moving in the vertical direction. hand,
A bracket provided on the column, a case holding a plurality of pipe electrodes provided on the bracket, an arm supported on the bracket so as to be movable in a single axial direction, and a third fixed to a tip of the arm. Opening / closing having a clip table 44 having a grip portion for supporting a pipe electrode shown in the drawing, and a clipper 43 which rotates around a shaft 33 provided on the clip table 44 and grasps the pipe electrode 12 with the clip table 44. When replacing the used pipe electrode 12 with the chuck 15 provided with the opening and closing member 3 which may be a claw and having a start hole through which the wire electrode 1 is passed through the workpiece 25,
As shown in the drawing, the clip base 44 and the clipper 43 of the opening / closing member claw 3 were gripped by being sandwiched between the clip base 44 and the clipper 43, and were replaced by pulling out.

[Problems to be solved by the invention]

Thus, the used pipe electrode 12 having the chuck 15 attached after it has been used for machining one or more start holes in the workpiece.
Is thin (usually about 2 to 3 mmφ in cross-sectional diameter) and long (for example, about 150 to 400 mm). Eccentricity or curvature is at the tip of the pipe electrode.
When the used pipe electrode 12 is grasped by a small grasping portion and sandwiched between the flat clipper 43 and the clip table 44 as shown in FIG. 12, the gripper 43 and the clip base 44 have different gripping positions, and often cannot be gripped. The present invention has been made for the purpose of providing a grasping device for grasping the pipe electrode 12 reliably without these disadvantages.

[Means for solving the problem]

A pipe electrode grasping device of the present invention that achieves the above object includes a bracket provided on a column of a wire-cut electric discharge machine, and a plurality of pipe electrodes provided on the bracket, preferably aligned in a uniaxial direction such as a Y-axis direction. And a clip table having a grip that supports a pipe electrode fixed to the distal end of the arm, and an arm that is supported on the bracket so as to be movable in a single axial direction, and a clip table that is provided on the clip table. An opening / closing member 3 having a clipper which rotates about an axis and grasps a pipe electrode with the clip base; and an opening / closing member 3 provided at one end of the opening / closing member 3 and rotates together with the opening / closing member to bring the pipe electrode into contact with the clip base. A guide portion that guides and moves toward the gripping portion is a semicircular arc, and the center of rotation of the opening / closing member 3 and the center of the arc are eccentrically mounted. It is obtained as comprising a.

(Operation)

When replacing the used pipe electrode 12 which is eccentric due to heat or impact or stress at the time of processing, and furthermore, the clipper 43 of the opening / closing member 3 is opened and the pipe electrode is turned toward the axis of the pipe electrode. Move the arm forward from a direction substantially perpendicular to the clip base while contacting the side of the pipe electrode with the arc surface of the guide 46.
Stop the arm where it touches the end face of 44. Then, when the clipper 43 is closed, the pipe electrode is guided and moved toward the grasping portion of the clip base by the arc surface of the guide 46 which rotates together with the opening / closing member 3. The pipe electrode is clamped and grasped by the grasping portion of the clip base. Since this grasped position is set so that the axis of the pipe electrode and the axis of the chuck coincide, after that, the ram is raised, the pipe electrode is pulled out of the chuck, and the arm is operated to move the grasping part. The clipper 43 of the opening / closing member 3 is opened in the collection box that has been moved or rotated, and the pipe electrode is dropped and discharged.

〔Example〕

 The present invention will be described with reference to the drawings.

In FIG. 1, the wire-cut electric discharge machine provided with the present invention applies a back tension to the wire electrode 1 from a reel 6 provided on an upper portion of a column 5 provided on a bed 4, and feeds the wire electrode. Then, the wire electrode 1 is pulled out from the reel 6, and a tension roller 9 driven by a motor 8 so that tension is generated in the wire electrode 1 by the winding roller 7, and the wire electrode 1 pulled out by the tension roller 9 is connected to the wire electrode 1. 1. There is a feed roller 10 provided for sending out at the time of automatic insertion or the like. A pair of feed rollers 10 including a capstan or a brake roller and a pinch roller for feeding the wire electrode 1 is driven by a motor 11, but is connected to the motor 11 by a one-way clutch (not shown). The wire electrode 1 is sent toward the pipe electrode 12, but when the wire electrode 1 is pulled and moved by the winding roller 7 such as during wire-cut electric discharge machining, the wire electrode 1 idles or the pinch roller is separated to pinch the wire electrode 1. Not to be. When cutting by the cutting device 13, the feed roller is instantaneously or for a predetermined time by a brake 14 operated by a solenoid or the like.
It is configured to be able to brake 10. Pipe electrode
The chuck 15 provided for supporting the 12 is a cap nut 48 which can be detached from the flange 47 with a screw, and a tacolet chuck 49 which can be detached in a concave portion of the cap nut 48 and which is te-fitted. A hard rubber packing 50 that covers the collet chuck 49 and has a conical portion on the outside and a conical concave portion that fits with the conical portion of the rubber packing 50. The structure has a piston 51 that narrows or loosens the collet chuck 49 via 50. The head 16 provided with the chuck 15 and the like is supported on a pipe processing shaft 17 and is moved vertically by a screw (not shown). The pipe processing shaft 17 has a U axis (X axis), V
It is supported by a UV table 18 that moves in the axis (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 20 fixed to the UV table 18,
An energizing pin that energizes the wire electrode 1 and an upper positioning guide of the wire electrode 1 that opens and closes by hydraulic pressure are accommodated. A sensor 23 for detecting when the tip of the pipe electrode 12 comes into contact is provided at a position separated from the center of the lower nozzle 22 provided opposite to the upper nozzle 21 by a predetermined dimension in the horizontal direction. The above-described hoisting roller 7 is provided on the lower arm 24 supporting the nozzle 22. The workpiece 25 facing the wire electrode 1 is mounted on a processing table 26, and the processing table 26 is mounted on a table 27 that moves in the X-axis and Y-axis directions perpendicular to each other. Surrounds the table cover 28. A bracket 29 provided at an appropriate position of the column 5 of such a wire cut electric discharge machine includes:
The arm 32 is supported so as to be movable in the horizontal direction and in the direction passing through the axis of the pipe electrode 12, and the movement is performed by a rack (not shown) attached to the arm 32 and a pinion that meshes with the rack. The rotation is performed by a motor (not shown) fixed to the bracket 29.
A fixed claw 2 having a flat gripping surface 34 for supporting the wire electrode 1 is fixed to the distal end of the arm 32, and a shaft 33 provided on a clip table 44 at the distal end of the arm 32 provided opposite thereto. And a flat gripping surface 35 for gripping the wire electrode with the fixed claw 2, and an axis 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 hard wire 36 having a core and having a diameter of about 1 to 30 mm (9th
FIG. A) is welded or provided with a stepped portion 37 (FIG. 9b) formed by cutting or the like in advance, and the like. And an opening / closing device for opening / closing. This opening / closing device includes a joint 39 fitted to a shaft 38 provided at the end of the opening / closing claw 3, a rod 40 connected to the joint 39, and an arrow B-
The motor 41 moves in the direction C, and the case 42 is attached to the motor 41 and fixed to the arm 32.

When the pipe electrode 12 is exhausted, a spare pipe electrode
As shown in FIG. 3, the spare pipe electrode 12 is mounted on a bracket 29 fixed to the upper part of the column 5 and a case 30 is attached thereto.
Is accommodated in the Y-axis direction, and the pusher 31 is pressed by a spring (not shown).

An arm 32 supported on the bracket 29 so as to be movable in the horizontal X-axis direction, a clip table 44 fixed to the distal end of the arm 32, and a shaft 33 provided on the clip table 44 are rotated. And a pipe electrode with the clip base 44
An opening / closing member 3 having a flat clipper 43 for grasping the opening / closing claw 43, and one end of the opening / closing member 3 and the opening / closing member 3 as shown in FIGS. The guide surface that rotates and moves the pipe electrode 12 toward the grip portion of the clip table 44 is a semicircular arc, and the center of rotation of the opening / closing member 3 and the center of the arc of the guide surface are biased. A guide 46 is provided which is attached with the center. When replacing the used pipe electrode 12 which is bent due to heat, action stress, or the like with the grasping device for the pipe electrode 12, the clipper 43 of the opening / closing member 3 is opened, and the arm is attached to the bracket 29 by a motor (not shown). 32 is advanced to the position of the pipe electrode 12 and moved while applying the pipe electrode to the arc surface of the guide 46 as shown in FIG. I do. When the opening / closing member 3 is turned by the operation of the rod 41 by the motor 41 to close the clipper 43, the guide 46 which turns together with the opening / closing claw 3 as shown by b → c → d → e → f in FIG. Pipe electrode 12 with arc surface
Is moved toward the grasping portion of the clip base 44, and the clip base 44 is moved.
Is reached, the clipper 43 and the gripper of the clip base 44 grasp the pipe electrode 12. Note that the guide 46 is provided below the opening / closing member 3, but in FIG. 8, it is described with hatching so as to be easily understood. The axis of the pipe electrode 12 grasped at this grasped position, that is,
Since the axis of the pipe electrode 12 grasped by the clip table 44 and the clipper 43 is set so that the axis of the chuck 15 coincides with the axis of the chuck 15, the ram 19 is thereafter raised to pull out the pipe electrode 12 from the chuck 15, The grasping unit is moved by operating the arm 32, or the pipe electrode 12 is discharged to the collection box 45 that has turned. Then, the arm 32 is retracted once in the direction of arrow C, and the case 30 is
Grab the spare pipe electrode 12 extruded from the
It is exchanged for a new pipe electrode 12 by moving the 32 forward and taking it below the chuck 15, lowering the head 16 and inserting a new pipe electrode 12 into the chuck 15.

When the wire electrode 1 is inserted into the pipe electrode 12, the wire electrode 1 may be sent out by the feed roller 10.

Now, a description will be given of the operation of cutting the wire electrode. First, when the wire electrode 1 is cut, the pipe electrode 12 is mounted on the chuck 15 and used, and the pipe electrode 12 is not mounted. And when the wire electrode 1 is removed during the cutting operation.

When the wire electrode 1 needs to be cut,
When the wire electrode 1 is in a stretched running state between the upper and lower nozzles 21 and 22 or the positioning guide, or in a state where the renewal feed of the wire electrode 1 is stopped, at the end of a certain wire cut electric discharge machining, For transition of automatic insertion of the wire electrode 1 or preparation for starting processing, or for cutting the tip of the wire electrode 1 for automatic insertion of the wire electrode 1 and aligning the tip of the wire electrode 1 for insertion, etc. In any case, the running wire electrode 1 stops updating and feeding, and in the case of wire electrode 1 insertion preparation or automatic insertion failure, such as when the tip is trimmed, the wire roller 1 is fed by the feed roller 10 in a predetermined amount. The wire electrode 1 is pressed by the brake 14 or by a pair of gripping claws (not shown) which are opened and closed by an electromagnet. In this case, when the pipe electrode 12 is mounted, the processing head 16 is connected to the pipe processing shaft 17. Along Then, the arm 32 is sent out by a motor (not shown) in the direction of arrow B with respect to the bracket 29 so that the gripper tip claw portion including the fixing and opening / closing claw comes to the traveling position of the wire electrode 1 outside the tip of the pipe electrode 12. The arm 32 is moved forward while the rod 32 is moved in the direction of arrow B, and the arm 32 is moved forward while the opening / closing claw 3 is opened. When the wire electrode 1 comes between the opened and closed claw 3 and the fixed claw 2, the rod 40 is moved in the direction of arrow C to close both claws, and then the working head 16 or the ram 19 is raised. After the wire electrode 1 is stretched, the wire electrode 1 is cut by the cutting device 13 and the tip of the wire electrode 1 is adjusted. Then, feed roller 10,
Alternatively, one of the grasping claws opened and closed by the pair of electromagnets (not shown) is reciprocated in the vertical direction, and the wire electrode 1 is inserted into the pipe electrode 12 while grasping each other.

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, or further gripping The mode of formation or application of the projection formed on the surface may be opposite to that of the illustrated embodiment.

〔The invention's effect〕

According to the present invention, when replacing a used pipe electrode that is bent due to heat, acting stress, or the like at the time of start processing, an arm that holds a clipper for holding a wire electrode and a clip base by opening a clipper of an opening / closing member. Is moved forward while the side surface of the pipe electrode is in contact with the arc side surface of the semicircular guide, and the arm is stopped where the pipe electrode contacts the end surface of the clip base. Then, when the clipper is closed, the pipe electrode moves toward the grasping portion of the clip base together with the opening / closing member along the arcuate surface of the rotating guide. Since the pipe electrode is grasped by the grasping section, the pipe electrode can be grasped reliably.

[Brief description of the drawings]

1 is a diagram of a wire-cut electric discharge machine equipped with a pipe electrode grasping device of the present invention, and FIG. 2 is a partial cross-sectional view of an enlarged portion of the pipe electrode grasping portion and the chuck of FIG. FIG. 3 is a view of an embodiment of the present invention of a wire electrode grasping claw and a pipe electrode grasping device, FIG. 4 is a partial view of an embodiment in which the guide of the present invention is attached in the view of arrow A in FIG. 3, and FIG. 3
FIGS. 6A and 6B are diagrams showing a conventional opening / closing member 3 and a clip base for grasping a pipe electrode, and FIG. 7 is an embodiment showing the present invention. Fig. 8
FIGS. A, b, c, d, e, and f are explanatory views showing a grasping process according to the embodiment of the present invention, and FIGS. 9a and 9b are diagrams illustrating fixed claws and open / close claws sandwiching a wire electrode. 1 Wire electrode 2 Fixed claw 3 Opening / closing member 12 Pipe electrode 15 Chuck 29 Bracket 30 Case 31 Pusher 32 Arm 43 Clipper 44 Clip table

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁶ , DB name) B23H 9/14 B23H 7/02 B23H 7/26

Claims (2)

(57) [Claims] 1. A wire electrode for processing a workpiece, a reel for storing the wire electrode, a feed roller for pulling out the wire electrode from the reel and sending out the extracted wire electrode, and a start hole in the workpiece. A pipe electrode to be machined,
A chuck that supports the pipe electrode, a head that moves the chuck in the vertical direction, and a pipe processing shaft that supports the head so that the head can be moved in the vertical direction;
In a wire electric discharge machine having a column provided with a ram or the like that moves in the vertical direction while supporting the pipe machining shaft, a case holding a bracket provided on the column and a plurality of pipe electrodes provided on the bracket A clip table having an arm horizontally supported by the bracket so as to be movable in a direction substantially perpendicular to the axis of the chuck supporting pipe electrode, and a gripping portion for supporting the pipe electrode fixed to the distal end of the arm An opening / closing member having a clipper that rotates about an axis provided on the clip base and grasps the pipe electrode with the clip base; and a pipe electrode that rotates together with an opening / closing member provided at one end of the opening / closing member. And a guide that moves toward a grip portion of the clip table. 2. The pipe electrode grasping device according to claim 1, wherein the guide has a semicircular arc and the center of rotation of the opening / closing member and the center of the arc are eccentrically mounted.