CN1111107C - Wire-cut electrical discharge machining method and device thereof - Google Patents

Abstract

A wire cutting discharge machining method and its apparatus, the processing wire electrode is through a parallel mechanism and vertical drawing of several guide blocks make the wire electrode send to an upper aircraft nose, the processing wire electrode is fed continuously at this moment, make it send a take-up pulley through a work piece, a aircraft nose of lower part, make the wire electrode reach a continuous route, and place the used waste wire electrode in a take-up cylinder, achieve the goal of threading automatically, make the wire discharge process go on; when the processing path is suddenly broken or needs to be replaced in the processing process, the function of automatically repairing the wire can be achieved through the actions of a wire end detection mechanism, a wire breaking mechanism, a wire head clamping mechanism and a wire pressing mechanism.

Description

Wire-cutting electric discharge machining method and device thereof

Technical field

The invention relates to a kind of wire-cutting electric discharge machining method and device thereof, but refer to a kind of self-threading and the apparatus and method of repairing the wire-cut electric discharge machine of line automatically especially.

Background technology

In known wire-cut electric discharge machine, when desire was processed a continuous path, the operator needed in the mode of processing starting point with manual threading line electrode to be passed head, workpiece and following head, finally arrive take-up pulley after, with the processing operation of discharging; And finish when a machining path of setting, when desire is changed next machining path, need in manual mode the line severing is moved on to next processing starting point, carry out the action of threading and processing again; If in a machining path, the behavior of broken string suddenly takes place, then need in manual mode, to deform or after deflection and unserviceable line segment remove, carry out the action of manual threading again, make line electrode be accomplished continuous lines footpath, and proceed to process operation.

Therefore, when using traditional wire-cut electric discharge machine,, the processing starting point carries out the manual threading of whole process except need consuming manpower, also need an operator to monitor in process on the side, in case the accident of broken string suddenly takes place process, and process is interrupted, influence processing progress.

Summary of the invention

Purpose of the present invention promptly is to provide a kind of wire-cutting electric discharge machining method and device thereof, it possesses the function that self-threading is arranged, can improve traditional wire-cut electric discharge machine, when processing starting point, change machining path or process break suddenly, need the shortcoming of manual threading down in straining pulley; The present invention more can provide the function of repairing line automatically, exempts the requirement that process needs operating personnel's complete monitoring, can reach process automation and the demand that reduces cost, increases product competitiveness.

Can reach the wire-cutting electric discharge machining method of foregoing invention purpose, comprise the following steps:

A) present a line electrode to several guiding blocks;

B) detect a line end of this line electrode and make it the location;

C) drive this several guiding blocks and interconnect and a parallel mechanism of synchronization action, vertically be directed to head on one and this line electrode is done one with these several guiding blocks; And

D) continue to present that this line electrode makes it to pass a workpiece, head arrives a take-up pulley once, finish continuous lines footpath.

Wherein the speed of moving down of this parallel mechanism is slightly larger than the feed rate of this line electrode.

A kind of wire-cutting electric discharge machining method of the present invention comprises the following steps:

A) present a line electrode to several guiding blocks;

B) detect a line end of this line electrode and make it the location;

C) continue to present this line electrode, this line electrode is arrived on one behind the head upper;

D) drive this several guiding blocks and interconnect and a parallel mechanism of synchronization action, and this line electrode is positioned with these several guiding blocks; And

E) continue to present that this line electrode makes it to pass a workpiece, head arrives a take-up pulley once, finish continuous lines footpath.

Also include an automatic wire repair method, it comprises the following steps:

F) furl in remaining line electrode to the take-up bucket;

G) line end of detecting broken string and make it the location;

H) present this line electrode one suitable length;

I) location and this line electrode of clamping;

J) this strained line end of severing;

K) remove this by the line end of distortion of severing; And

L) carry out the threading step again.

A kind of wire-cut electric discharge machining apparatus of the present invention comprises:

One in order to present the device of a line electrode;

Several guiding blocks, it can receive the line electrode of being presented by this feeding means;

One parallel mechanism, itself and this several guiding blocks interconnect and synchronization action; And

One drive unit, its several guiding blocks that can drive this parallel mechanism and synchronization action are evenly overhanging, and this line electrode is directed to head on, arrive a take-up pulley so that this line electrode passes a workpiece, finish continuous lines footpath.

Also include a guiding device, its bootable each guiding block is done a linear movement.

The conical surface that top tool one alcove of each guiding block wherein, bottom tool one and this alcove cooperatively interact, but make fluid-tight engagement between two adjacent guiding blocks.

Also include one and be arranged at the folder removal apparatus that one in these guiding blocks are not held guiding block, when the line end of this line electrode is positioned, this this line electrode of folder removal apparatus clamping, the straining pulley idle running in this feeding means, this parallel mechanism then moves down backguy.

Also include one and repair line apparatus automatically, it includes:

One line end arrangement for detecting is in order to a line end of detecting this line electrode and with it location;

One cord grip is in order to locate this line electrode;

One break wire device is removed in order to this continuous line electrode of severing and with a strained line end;

One folder removal apparatus removes this broken string in order to folder; And

One machine straightening device is in order to this line end linearization(-sation).

Wherein this machine straightening device is to make a hot gas by a predetermined path, and this line end is heated, and reaches straightening and makes the line end linearization(-sation).

Wherein this machine straightening device is between at least two mobile guiding blocks, passes to electric current to do straightening.

Description of drawings

See also the detailed description and the accompanying drawing thereof of following relevant a preferred embodiment of the present invention, can further understand technology contents of the present invention and purpose effect thereof, wherein:

Main configuration diagram when Fig. 1 contracts in parallel mechanism for wire-cut electric discharge machine of the present invention; And

Fig. 2 is similar to Fig. 1, and is the main configuration diagram of this parallel mechanism when overhanging.

The specific embodiment

Please consult Fig. 1 and Fig. 2 simultaneously, wire-cut electric discharge machine provided by the present invention, be to use a parallel mechanism 24, line electrode 13 can be done vertical distraction, make it arrive go up head 30, the working fluid that is provided by last head 30 inside again, the guiding of the fluid column that produces through nozzle, make line electrode 13 pass workpiece 31, following head 32 arrival take-up pulleies 37, finish the action of self-threading.And when unexpected broken string of process generation or desire replacing machining path, can finish the purpose of the end of a thread processing and threading by repairing line apparatus and automatic threading device automatically.

Automatic threading device of the present invention includes the guiding block 22a-22g, one and the parallel mechanism that interconnects of this several guiding block 22a-22g 24, a folder removal apparatus 25, a line end arrangement for detecting 25b, a guiding device 28 and a drive unit 23 of several same configuration and linear arrangement.When a line electrode 13 winds the line by line wheel 11 through manual, by several guide rollers 12,14 and 15, one fabric wheel 16, a guide roller 17, a straining pulley 18 and a fabric wheel 19, and when arriving the first guiding block 22a, promptly by these straining pulley 18 automatic line sendings, make line electrode 13 pass the hole, Central Line of each guiding block 22a-22g, this line wheel 11, several guide rollers 12,14 and 15, fabric wheel 16, guide roller 17, straining pulley 18 and fabric wheel 19 etc. consist of one in order to this line electrode 13 is fed to the feeding means of these guiding blocks 22a-22g.Top tool one alcove 40 of each guiding block 22a-22g, the bottom is a conical surface 41, can make to form between two adjacent guiding block 22a-22g to cooperate, when line electrode 13 is sent for 18 times by straining pulley, guarantee that line electrode 13 passes through the interface of two adjacent guiding block 22a-22g smoothly.

When delivering to the below of last guiding block 22g under the end of a thread, responded to by this line end arrangement for detecting 25b immediately, this moment by one for example the drive unit 23 of pneumatic cylinder drive these last guiding block 22g, make it be subjected to the guiding of this guiding device 28, and the linear position of connecting airtight mutually with last head 30 that moves to, when this last guiding block 22g is linear mobile, drive the parallel mechanism 24 fix on it simultaneously and extend into as shown in Figure 2 extended position by retracted position shown in Figure 1, the parallel mechanism 24 of this extension drive again except that first and last guiding block linear thereupon the moving of all the other guiding block 22b-22f, each guiding block 22b-22f is evenly stretched, use and do vertical and traction uniformly line electrode 13, it is arrived go up head 30, again via the guiding of the Working liquids of last head 30 inside, make line electrode 13 reach head 32 down by workpiece 31, pass through lead seat 33 again, guide roller 35 and conduit 36, arrive take-up pulley 37, fabric wheel 38, promptly finish continuous lines footpath, via last, give electric piece 29 down, 34 conducting, the processing operation of can discharging places scrap wire take-up bucket 39 at last.

When line electrode is responded to by line end arrangement for detecting 25b, the speed that parallel mechanism 24 moves down needs and the line sending speeds match, the speed that parallel mechanism 24 moves down is slightly larger than straining pulley line sending speed, so that last guiding block 22g engages with last head 30 earlier, avoid line end to touch head 30 and cause wearing and tearing or line end to locate, and make line end can't enter head 30.

Parallel mechanism 24 used in the present invention has the function of quick guiding, only need small input travel, can do bigger delivery stroke, therefore can use the drive unit of less stroke, and when parallel mechanism 24 is not done the threading guiding, can in contract to save the space, help the arrangement of other devices, be aided with the guiding of guiding device 28, more can increase its positioning accuracy, wherein guiding device 28 is positioned at parallel mechanism 24 belows, and each guiding block 22a-22g for example slides on the guiding device 28 of slide rail respectively at this; And when parallel mechanism 24 is driven when moving down,, help the location of line electrode 13 because of the characteristic of mechanism evenly distributes each guiding block 22a-22g.

And when desire is changed machining path, after one cord grip 26 is located line electrode 13, by this folder removal apparatus 25 that has disconnection function simultaneously continuous line electrode is divided into two parts up and down immediately, Lower Half is delivered in the take-up bucket 39 by take-up pulley 37, the line end of the first half is regained by straining pulley 18, behind arrangement for detecting 25b location, after workpiece 31 promptly moved to next processing starting point, the line electrode of the first half carried out threading by automatic threading device immediately and links; When if process takes place to break suddenly, then the Lower Half line electrode is delivered in the take-up bucket 39 by take-up pulley 37 equally, the line electrode of the first half is regained by straining pulley 18, when line end arrangement for detecting 25b induction the end of a thread, straining pulley 18 stops take-up, down send the line electrode of a suitable length immediately, can be to guarantee line end by 27 clampings of folder removal apparatus; Then cord grip 26 is located, but guarantees that line electrode is positioned at the position of clamping; The end of a thread folder removal apparatus 27 location, the clip 27b of device end is driven, and in the mode of horizontal clamping line electrode is clamped, in case the remaining line electrode in broken string back drops; After line electrode 13 is held, promptly produce high-pressure hot gas by machine straightening device 20, hot gas is after guiding, side by the first guiding block 22a is blown into toward the outlet of last guiding block 22g, to reach the heating straightening and to make the line end linearization(-sation), and allow that line electrode 13 is easy to by workpiece 31 etc., increasing the threading success rate, the hot gas amount then can be adjusted by control valve 21; After straightening was finished, folder removal apparatus 25 location were adopted the thermo-contact mode and are broken, with distortion or line severing around song takes place, remaining the end of a thread is removed by the end of a thread folder removal apparatus 27 immediately, after remaining the end of a thread is removed, automatically repair the line action and finish, can carry out the self-threading action.

Automatically the line apparatus of repairing of the present invention, can with deform because of processing or around the line end severing of song with remove, gets rid of bad the end of a thread to about the abrasion of head, and make it pass workpiece smoothly, the action of self-threading is accomplished, so that the processing operation is continued.

Wire-cutting electric discharge machining method provided by the present invention and device thereof with other located by prior art mutually relatively the time, have more and have following advantage:

1) wire-cut electric discharge machine of the present invention, use the guiding of a parallel mechanism as the line electrode threading, can success line electrode is directed to head, and when stretching along with parallel mechanism, the guiding block that is installed on this parallel mechanism also evenly stretches thereupon, line electrode can be done guiding completely; And

2) wire-cut electric discharge machine of the present invention has automatic broken string and the function of repairing line, can and remove distortion, the line end severing that can't use around song, in order to the carrying out of threading.

Above-listed detailed description is specifying at a possible embodiments of the present invention, only this embodiment is not in order to limit claim of the present invention, allly do not break away from the equivalence that skill spirit of the present invention does and implement or change, for example: the device of parallel mechanism also can adopt driving screw moving or the combination of tooth bar and pinion and the equivalence embodiment that break wire device also can adopt variations such as knife severing, all should be contained in the autocratic scope of this case.

Claims (11)

1. A wire-cut electrical discharge machining method, characterized in that, comprises the following steps: a) feeding a line of electrodes to several guide blocks; b) detecting and locating a line end of the line electrode; c) drive the plurality of guide blocks and a parallel mechanism that is connected with the plurality of guide blocks and acts synchronously, and guide the wire electrode vertically to an upper machine head; and d) Continuously feed the wire electrode through a workpiece, lower the machine head to a take-up wheel, and complete a continuous wire diameter. 2 . The wire-cut electric discharge machining method according to claim 1 , wherein the downward movement speed of the parallel mechanism is slightly greater than the feeding speed of the wire electrode. 3 . 3. A wire-cut electrical discharge machining method, characterized in that, comprising the following steps: a) feeding a line of electrodes to several guide blocks; b) detecting and locating a line end of the line electrode; c) continue to feed the wire electrode so that the wire electrode reaches the top of an upper machine head; d) driving the plurality of guide blocks and a parallel mechanism that is connected with the plurality of guide blocks and acts synchronously to position the wire electrode; and e) Continuously feed the wire electrode through a workpiece, lower the machine head to a take-up wheel, and complete a continuous wire diameter. 4. The wire-cut electrical discharge machining method according to claim 3, further comprising an automatic wire repairing method comprising the following steps: f) Rolling up the residual wire electrode into a wire take-up barrel; g) Detect and locate the broken wire end; h) feeding the wire electrode an appropriate length; i) positioning and clamping the wire electrode; j) cutting off the deformed wire end; k) removing the severed deformed wire end; and l) Repeat the threading step. 5. A wire-cut electrical discharge machining device, characterized in that it comprises: a device for feeding a wire electrode; a plurality of guide blocks, which can receive the wire electrodes fed by the feeding device; a parallel mechanism, which is connected with the plurality of guide blocks and acts synchronously; and A driving device, which can drive the parallel mechanism and several guide blocks that act synchronously to extend out evenly, guide the wire electrode to an upper machine head, so that the wire electrode passes through a workpiece to reach a take-up wheel, Complete a continuous wire diameter. 6 . The wire-cut electric discharge machining device according to claim 5 , further comprising a guide device, which can guide each guide block to perform a linear movement. 7 . 7. The wire-cut electrical discharge machining device according to claim 5, wherein the upper part of each guide block has a concave chamber, and the lower part has a tapered surface that cooperates with the concave chamber, so that two adjacent The guide blocks can be closely connected. 8. The wire-cut electrical discharge machining device according to claim 5, further comprising a clamping device for an end guide block disposed among the guide blocks, when the wire end of the wire electrode is During positioning, the clamping device clamps the wire electrode, a tension wheel in the feeding device rotates idly, and the parallel mechanism moves down the pull wire. 9. The wire-cut electrical discharge machining device according to claim 5, further comprising an automatic wire-repairing device comprising: a wire end detecting device, used for detecting the wire end of the wire electrode and positioning it; a wire crimping device for positioning the wire electrode; a wire breaking device for cutting the continuous wire electrode and removing a deformed wire end; a clipping device for clipping the broken wire; and A straightening device is used to straighten the end of the wire. 10. The wire-cut electrical discharge processing device according to claim 9, wherein the straightening device makes a hot gas pass through a predetermined path to heat the wire end to achieve straightening and make the wire end linear . 11 . The wire-cut electrical discharge machining device according to claim 9 , wherein the straightening device passes current between at least two moving guide blocks for straightening. 12 .