JP5913751B2 - Wire electric discharge machining method and wire electric discharge machining apparatus - Google Patents

Description

  The present invention relates to a wire electric discharge machining method and a wire electric discharge machining apparatus, and more particularly to a wire electric discharge machining method and the like for cutting a workpiece in a wire electric discharge machining apparatus.

  The wire electric discharge machining apparatus uses a wire electrode to machine a workpiece such as cemented carbide or hardened steel. An upper head is attached above the workpiece, and a lower head is attached below the workpiece so as to face the upper head. The wire electrode is fed out from the source bobbin and discarded through the guide member via the upper head and the lower head.

  In the wire electric discharge machining apparatus, an electric discharge phenomenon is generated between the wire electrode and the workpiece to realize machining such as cutting of the workpiece. At this time, if the machining shape of the workpiece is cut off at a time, a portion cut out from the workpiece (hereinafter referred to as a “cutout”) hits the lower head and damages the apparatus. For this reason, in general, a part of the first cut (first cut) is not processed, but the cutout is separated from the workpiece by other means, and electric discharge machining after the second cut or all cutouts are processed with wire electrodes. In other words, a processing method (breaking processing) for discharging as scraps has been performed.

  The applicant holds the work piece on the work piece by performing the electric discharge machining on the whole work shape of the work piece and melting the part of the wire electrode in at least one place of the work shape. (See Patent Document 1; hereinafter referred to as “core stitch” (registered trademark)). As a result, it is possible to process the cutout in a state where it can be easily separated from the workpiece by a single electric discharge machining, the number of man-hours can be reduced, and a break-up program is not required.

JP 2012-166332 A

  However, the technique described in Patent Document 1 is processing up to a state in which a cutout is held. For this reason, the machining is temporarily stopped, and the operator manually drops and removes the cutout, and then finishes. The process was not continuous and could not be unmanned.

  Therefore, an object of the present invention is to provide a wire electric discharge machining method and the like suitable for shortening the time from roughing to finishing and making it unmanned as much as possible.

  A first aspect of the present invention is a wire electric discharge machining method for cutting a workpiece in a wire electric discharge machining apparatus, wherein the wire electric discharge machining apparatus is positioned above the workpiece via a wire electrode. A head portion and a lower head portion positioned at a lower portion of the workpiece via the wire electrode, and a cutout of the workpiece is melted at a part of the processing shape by melting a part of the wire electrode From the workpiece, the uncut machining step for holding the workpiece by the generated welded portion, the moving step for changing the relative positional relationship between the upper head portion and / or the lower head portion and the workpiece, and the workpiece from the workpiece It includes a separation step of separating the cutout.

  A second aspect of the present invention is the wire electric discharge machining method according to the first aspect, wherein in the separation step, the upper head part and / or the lower head part are ejected from the workpiece by jetting a liquid. The cutout is separated.

  A third aspect of the present invention is the wire electric discharge machining method according to the first or second aspect, wherein in the separation step, the wire electrode is supplied, and the cutout is detected by detecting the contact of the wire electrode. It is determined whether or not is removed.

  A fourth aspect of the present invention is the wire electric discharge machining method according to the first aspect, wherein the wire electric discharge machining apparatus moves together with the upper head part and / or the lower head part and has a cylinder function. In the separation step, the separation part separates the cutout by a cylinder stroke.

  According to a fifth aspect of the present invention, there is provided a wire electric discharge machining method according to the fourth aspect, wherein in the separation step, when the cylinder stroke does not penetrate the workpiece, the cylinder stroke is again performed. Is to do.

  A sixth aspect of the present invention is a wire electric discharge machining method according to any one of the first to fifth aspects, and includes a finishing step of performing a finishing process after separating the cutout.

  A seventh aspect of the present invention is the wire electric discharge machining method according to any one of the first to sixth aspects, wherein the wire electric discharge machining apparatus collects the cutout separated on the upper side of the workpiece. And a separating unit that separates the cutout from the lower side to the upper side of the workpiece, and the collecting unit collects the separated cutout.

  An eighth aspect of the present invention is the wire electric discharge machining method according to any one of the first to sixth aspects, wherein in the separation step, the separation unit drops the cutout from the upper side of the workpiece. To separate.

  According to a ninth aspect of the present invention, there is provided a wire electric discharge machining apparatus for cutting a workpiece, wherein an upper head portion positioned above the workpiece via a wire electrode and the wire electrode passes through the wire head. A lower head portion located at a lower part of the workpiece, and a control unit for controlling the positions of the upper head portion, the lower head portion, and the workpiece; The workpiece is held by the welded portion formed by melting a part of the wire electrode in at least one place, and the control unit is configured to position the upper head portion and / or the lower head portion relative to the workpiece. After changing the relationship, the cutout is separated from the workpiece.

  In addition, the collection | recovery part of the 7th viewpoint collect | recovers what was isolate | separated by pushing or pushing out using a cylinder so that the suction inlet of a vacuum device may be attached, for example on the upper side.

  The invention of the present application is a program for realizing the wire electric discharge machining method according to the first to seventh aspects by a computer in the wire electric discharge machining apparatus, and a computer-readable recording medium for regularly recording the program. You may catch it.

  According to each aspect of the present invention, a cut-out object held by a holding unit using a core stitch is automatically separated by a separation unit, so that roughing to finishing are automatically performed by a machine. This also makes it possible to significantly reduce the processing time for the cutting process. This is expected to be effective especially when there are many small cutouts. Furthermore, after the upper head and the lower head are moved, the separation part separates the cutout, so that the head is not damaged.

  Furthermore, according to the 2nd viewpoint, a cutout can be isolate | separated by jetting a liquid. In the wire processing apparatus, a liquid is used for processing, and separation can be performed using such a liquid. Thus, in the second aspect, the liquid may be used for a cutting process or the like. In this case, it can be realized by the functions of the upper head unit and the lower head unit, and there is no need to add a new device.

  Further, according to the third aspect, confirmation of the removal of the cutout is performed by, for example, performing wire electrode supply operation by automatic connection (AWF) and detecting contact of the wire (for example, whether the wire electrode can be connected). Can be realized. This can be realized by the functions of the upper head part and the lower head part, and it is not necessary to add a new device.

  Furthermore, according to the 4th viewpoint, it becomes possible to implement | achieve a isolation | separation part by simple structures like a cylinder function.

  Further, according to the fifth aspect, it is possible to reliably separate the cutout by determining whether or not the cutout is separated by the cylinder stroke length.

  Furthermore, according to the sixth aspect, it is possible to automatically perform from roughing to finishing by a machine, and it is possible to greatly reduce the processing time by the cut-out process.

  Furthermore, according to the seventh aspect, the separation unit reduces the influence of gravity or the like by applying force or the like to the cutout from the side opposite to the gravity from the lower side of the workpiece. , Can be separated stably. And a collection | recovery part does not damage an upper head, a workpiece | work, etc. by collect | recovering on the upper side of a workpiece.

  Furthermore, according to the 8th viewpoint, a separation part can drop and isolate a cutout thing by separating a cutout thing from the upper side of a workpiece. In addition, you may collect | recover reliably, without providing the collection | recovery part which collects fallen objects, and letting a cutout thing flow by a water flow.

It is a block diagram which shows the outline | summary of a structure of the wire electric discharge machining apparatus which concerns on the Example of this invention. It is a flowchart which shows an example of operation | movement of the wire electric discharge machining apparatus 1 of FIG. It is a block diagram which shows the outline | summary of a structure in the case of implement | achieving the wire electric discharge machining apparatus of FIG. 1 by a cylinder stroke. It is a figure which shows the specific example of a device of the lower head part 35, the cylinder part 41, and the fixing | fixed part 43 of FIG. It is a block diagram which shows the outline | summary of the other structure when implement | achieving the wire electric discharge machining apparatus of FIG. 1 by a cylinder stroke. FIG. 6 is a diagram illustrating a specific device example of an upper head portion 65, a cylinder portion 71, and a fixing portion 73 in FIG.

  Embodiments of the present invention will be described below with reference to the drawings. The embodiment of the present invention is not limited to the following examples.

  FIG. 1 is a block diagram showing an outline of the configuration of a wire electric discharge machining apparatus according to an embodiment of the present invention.

  In this example, a case where a plurality of holes having a diameter or a long side of 5.0 mm or less (for example, 9 or more in 3 rows and 3 rows) are continuously drilled in a carbide material having a plate thickness of 10.0 mm or less. Assuming (manufacture of many small thin holes). In such processing, first make a pilot hole in the material, perform roughing and finishing using core stitches, and meet the required accuracy such as shape dimensions, mutual position, surface roughness of the processed surface, etc. To do.

  The biggest bottleneck in this processing method is processing of unnecessary cutouts (cores) generated during rough processing. If it is cut off at the time of processing, an unnecessary cutout material falls to the lower head portion, which causes a problem in wire recovery of the lower head portion. Since unnecessary cutouts are small, in many cases, a method of machining the entire core and discharging it as electric discharge machining waste (breaking process) has been employed. However, in such processing, it is impossible to realize the shortening of the processing in the cut-out processing, which is the greatest feature of the wire electric discharge processing. For this reason, processing time per week may be required.

The wire electrical discharge machining apparatus 1 includes a source bobbin 3, an upper head part 5 (an example of an “upper head part” in the claims), a lower head part 7 (an example of a “lower head part” in the claims), It includes a guide member 9, a separation unit 11 (an example of "separating portion" of the claims), a collecting section 1 3, the control unit 17, a storage unit 19. The separation unit 11 may be realized by, for example, a special device, or may be realized by a function of the upper head unit 5, the lower head unit 7, and the like. Therefore, in FIG. 1, it represents with the broken line.

  The wire electric discharge machine 1 uses a wire electrode to cut out a workpiece 21 (for example, cemented carbide, hardened steel, etc., which is an example of “workpiece” in the claims). The cutout 23 (generally also referred to as “core”) is produced by a cutout process. This cut-out process is realized by the core / stitch technique described in Patent Document 1, and the cut-out object 23 is held by the work piece 21 by the welded portion 25 in at least one place of the work shape of the work piece 21. The welding part 25 is implement | achieved by changing the electrical processing conditions applied between a wire electrode and the workpiece 21 from a process cycle to a welding cycle, and fuse | melting a part of wire electrode.

  Here, the processing cycle is for performing a normal cutting process. The welding cycle is for welding a part of the workpiece 21 and the cutout 23 by the welding portion 25 while cutting the workpiece 21. The welding cycle can be realized, for example, by shifting from machining discharge to arc discharge. The transition from machining discharge to arc discharge is, for example, lowering the power peak flowing from the high voltage load to the wire electrode (for example, about 1/4 times) compared to the current in the machining cycle, and This can be realized by lowering the voltage applied between the electrodes (for example, about 1/4 times) and lengthening the current pulse flowing through the wire electrode (for example, about twice).

  The control unit 17 controls the operation of the wire electric discharge machining apparatus 1 according to the program stored in the storage unit 19.

  The upper head portion 5 is attached above the workpiece 21. The lower head portion 7 is attached below the workpiece 21 so as to face the upper head portion 5. The wire electrode is sent out from the source bobbin 3 and discarded via the upper head portion 5 and the lower head portion 7 through the guide member 9.

  The separation unit 11 separates the cutout 23 from the workpiece 21. For example, a liquid is used in a wire electric discharge machining apparatus. The upper head portion 5 and the lower head portion 7 are necessarily provided with a device for jetting the liquid at a high pressure. Using this high-pressure liquid jet, the core held by the welding process is separated. For example, if the jet of the upper head part 5 is used, the core can be separated vertically downward. Further, if the jet of the lower head portion 7 is used, the core can be separated vertically upward. Then, the confirmation of the cutout removal may be realized, for example, by performing a wire electrode supply operation by AWF and using wire contact detection (for example, whether the wire electrode can be connected). This can be realized by the functions of the upper head part and the lower head part. Further, the separation unit 11 may use, for example, a hit using a cylinder mechanism. First, the case where a high-pressure jet is used will be described. Next, a case where separation is performed using a cylinder mechanism will be described.

Recovery unit 1 3 is intended for collecting the cut-out material 23 separated. The separated core is divided into a case where collection is necessary and a case where the core is left as it is until the entire processing is completed. Recovery unit 1 3, collecting at least the collection is required core. Recovery unit 1 3, when collecting the core separated vertically upward, is provided in the upper head portion 5 side. In this case, it can be discharged outside the apparatus by vacuum or the like. Recovery unit 1 3, when collecting the core separated vertically downward, is provided in the lower head part 7 side. For example, a net-like basket or the like may be provided on the lower head portion 7 side. A small core that is not large enough to fill the gap between the head and the processing tank may be left because it does not interfere with the movement of the head. Also, small cores that are cut off may be discharged by a water stream. In addition, for example, a wiper can be provided on the lower head portion 7 so that a small core cut off to the discharge hole can be scraped off.

  FIG. 2 is a flowchart showing an example of the operation of the wire electric discharge machining apparatus 1 of FIG.

  First, the wire electric discharge machine 1 performs a cutting process using a core stitch (step ST1). The unnecessary cutout 23 is held by the welding portion 25 by welding, and roughing is continuously performed using automatic connection (AWF).

  After performing roughing continuously, the control unit 17 moves the upper head unit 5 and / or the lower head unit 7 (step ST2). For example, when a high pressure jet is used, the positional relationship between the upper head portion 5 and the lower head portion 7 is shifted using the U-V axis for driving the upper head. In general, it can be shifted up to ± 60mm.

Subsequently, the control unit 17 causes the separation unit 11 to separate the cutout 23 attached to the workpiece 51 by a high-pressure jet (step ST3). Recovery unit 1 3 recovers the cutout product 23 separated.

  After all unnecessary cutouts 23 are cut off, finishing is continuously performed (step ST4). Thereby, the core processing time is shortened, the machining time can be shortened as a whole, the amount of wire electrode used can be reduced, and the amount of power used for machining can be reduced.

  FIG. 3 is a block diagram showing an outline of an example of a specific configuration of the wire electric discharge machining apparatus of FIG. The wire electrical discharge machining device 31 includes a source bobbin 33, an upper head part 35 (an example of an “upper head part” in the claims), a lower head part 37 (an example of the “lower head part” in the claims), A guide member 39, a cylinder part 41 (an example of a “separation part” in the claims of the present application), a fixing part 43, a recovery part 45, a control part 47, and a storage part 49 are provided.

  The source bobbin 33, the upper head part 35, the lower head part 37, and the guide member 39 in FIG. 3 are the same as the source bobbin 3, the upper head part 5, the lower head part 7, and the guide member 9 in FIG. The workpiece 51 and the cutout 53 are welded by the welded portion 55 by core stitching.

  The control unit 47 controls the operation of the wire electric discharge machining apparatus 31 according to the program stored in the storage unit 49.

  The cylinder portion 41 is positioned below the workpiece 51 and separates the cutout 53 from the workpiece 51 by a cylinder stroke that raises the cylinder. Then, the cylinder is lowered and returned to the initial position. The cylinder part 41 is fixed to the lower head part 37 by a fixing part 43. Therefore, the cylinder part 41 moves as the lower head part 37 moves. That is, the control unit 47 executes a command for moving the lower head unit 37 and performs control to move the lower head unit 37, so that the cylinder unit 41 also moves. Therefore, it is not necessary to prepare a separate command for moving the cylinder part 41. In this embodiment, a command for raising the cylinder of the cylinder part 41 and a command for lowering the cylinder of the cylinder part 41 are newly added.

  The collection unit 45 is for collecting the separated cutout 53 above the workpiece 51. The collection unit 45 may be fixed to the upper head unit 35. The collection unit 45 is, for example, a suction port of a vacuum device installed outside the processing tank. By comprising in this way, the unnecessary cutout 53 which was isolate | separated by the cylinder part 41 and was extruded to the upper side of the workpiece is attracted | sucked by the collection | recovery part 45, and is discharged | emitted out of a processing tank. Therefore, unnecessary cutout 53 does not accumulate inside the processing tank, and the movement of the processing machine is not limited by the amount of cutout 53, and automatic operation for a long time is possible.

  Then, with reference to FIG. 2, an example of operation | movement of the wire electric discharge machining apparatus 31 of FIG. 3 is demonstrated.

  First, the wire electric discharge machine 31 performs a cut-out process using a core stitch (step ST1). The unnecessary cutout 53 is held by the welding portion 55 by welding, and roughing is continuously performed using automatic connection (AWF).

  After performing roughing continuously, the control unit 47 moves the upper head unit 35 and the lower head unit 37 (step ST2). At this time, the cylinder part 41 also moves. The control part 47 positions the cylinder part 41 below the cutout 53. Since the control unit 47 knows the position of the lower head unit 7 at the end of machining and the relative positional relationship between the lower head unit 37 and the cylinder unit 41 is determined, the control unit 47 is The position of the cylinder part 41 can be grasped. Then, the lower head portion 37 is moved and positioned below the cutout 53. It is desirable that the cutout 53 is separated in the vertically upward direction as much as possible. Therefore, the cylinder of the cylinder part 41 is moved so as to be below the center of gravity of the cutout 53, for example. Note that the control unit 47 may change the relative positional relationship between the upper head unit 35 and / or the lower head unit 37 and the workpiece 51. For example, the workpiece 51 may be moved so that the cylinder portion 41 is below the center of gravity of the cutout 53.

  Then, the control part 47 raises the cylinder of the cylinder part 41, and isolate | separates the adhering cutout 53 to a vertical upward direction (step ST3). At this time, the upper head part 35 is moving, and the recovery part 45 recovers the cutout 53, so that the cutout 53 does not directly hit the upper head part 37.

  In step ST3, it is important to determine whether or not the cutout 53 is in the workpiece 51. Therefore, the control part 47 measures the length (stroke length) which the cylinder raised. If the cylinder rises above the upper surface of the workpiece, it is assumed that the cutout 53 is separated from the workpiece 51, the cylinder is lowered, and the process proceeds to step ST4. Separation processing is performed. If the cylinder does not rise to the upper surface of the workpiece 51 (ie, if the cylinder does not penetrate the workpiece 51), the cylinder 53 is lowered assuming that the cutout 53 remains in the workpiece 51, Again, separation processing is performed on the same cutout 53. Thus, in step ST3, it is determined whether or not the unnecessary cutout 53 remains on the workpiece 51 using the stroke length, and if it remains, retry is performed. The presence / absence of the cutout 53 may be determined by, for example, wire electrode contact detection or AWF, in addition to the stroke length.

  After all unnecessary cutouts 53 are cut off, finishing is continuously performed (step ST4). Thereby, the core processing time is shortened, the machining time can be shortened as a whole, the amount of wire electrode used can be reduced, and the amount of power used for machining can be reduced.

  FIG. 4 is a diagram illustrating a specific example of the lower head portion 37, the cylinder portion 41, and the fixing portion 43 in FIG. (A) is before the stroke, and (b) is after the stroke. In this way, by attaching the cylinder part 41 to the lower head part 37, although a command is added for the vertical movement of the cylinder, it is possible to realize the core processing without adding a special command for the movement. It becomes.

  FIG. 5 is a block diagram showing an outline of the configuration of a wire electric discharge machining apparatus according to another embodiment of the present invention. As another embodiment, a case where the positions of the cylinder part 41 and the collection part 45 in FIG. 2 are exchanged will be described.

  The wire electrical discharge machining apparatus 61 includes a source bobbin 63, an upper head portion 65 (an example of an “upper head portion” in the claims of the present application), a lower head portion 67 (an example of the “lower head portion” of the claims of the present application), A guide member 69, a cylinder part 71 (an example of a “separation part” in the claims of the present application), a fixing part 73, a recovery part 75, a control part 77, and a storage part 79 are provided.

  The source bobbin 63, the upper head part 65, the lower head part 67, and the guide member 69 in FIG. 5 are the same as the source bobbin 3, the upper head part 5, the lower head part 7, and the guide member 9 in FIG. The workpiece 81 and the cutout 83 are welded by the welded portion 85 by core stitching.

  The cylinder part 71 is located above the workpiece 81 and lowers the cylinder to separate the cutout 83 from the workpiece 81. Although the cutout 83 falls, the lower head portion 67 moves and does not damage the lower head portion 67. If the cutout 83 is a small core that is not large enough to fill the gap between the lower head portion 67 and the processing tank, even if the cutout 83 falls, the cutout 83 does not interfere with the movement of the lower head portion 67.

  The fixing portion 73 fixes the cylinder portion 71 to the upper head portion 65. The control unit 77 moves the cylinder unit 71 by moving the upper head unit 65 and moves the cylinder up and down in accordance with the program stored in the storage unit 79 and separates the cutout 83 from the workpiece 81. The operation of the wire electric discharge machining apparatus 61 of FIG. 5 is the same as the flowchart of FIG.

  The recovery unit 75 recovers the separated cutout 83. For example, the collecting unit 75 may be realized by attaching a basket-like accessory to the lower side of the cutout 83 when at least the cylinder unit 71 performs a cylinder stroke. Thereby, it can prevent that the cut-out thing 83 cut off is poured by a water flow. Further, a wiper may be provided on the lower head portion 67 so as to scrape the cutout 83 cut off to the discharge hole.

  FIG. 6 is a diagram showing a specific device example of the upper head portion 65, the cylinder portion 71, and the fixing portion 73 in FIG. (A) is a bird's-eye view, (b) is before the stroke, and (c) is after the stroke. In this way, by attaching the cylinder portion 71 to the upper head portion 65, it is possible to realize core processing without adding a special command regarding movement.

1,31,61 wire electric discharge machining apparatus, 3,33,63 source bobbin, 5,35,55 upper head portion, 7,37,67 lower head portion, 9,39,69 guide member 11 separating section 1 3 , 45, 75 Recovery unit, 17, 47, 77 Control unit, 19, 49, 79 Storage unit, 21, 51, 81 Workpiece, 23, 53, 83 Cutout, 25, 55, 85 Welding unit, 41, 71 Cylinder part, 43, 73 fixed part,

Claims (11)

A wire electrical discharge machining method for cutting a workpiece in a wire electrical discharge machining apparatus,
The wire electrical discharge machining apparatus is
An upper head portion located above the workpiece via a wire electrode;
Comprising a lower head part located at the bottom of the workpiece via the wire electrode;
An uncut processing step for holding the cutout of the work piece on the work piece by a welded portion formed by melting a part of the wire electrode in at least one place of a work shape;
At least move the upper head part without moving the lower head part , or move the lower head part without moving the upper head part, and the upper head part and the lower head part A moving step for performing a moving process for making the positional relationship different from that at the time of machining;
A wire electric discharge machining method including a separation step of separating the cutout from the workpiece to the underside of the workpiece by the upper head portion jetting liquid. A wire electrical discharge machining method for cutting a workpiece in a wire electrical discharge machining apparatus,
The wire electrical discharge machining apparatus is
An upper head portion located above the workpiece via a wire electrode;
A lower head portion located at a lower portion of the workpiece via the wire electrode;
A recovery unit for recovering the cutout separated on the upper side of the workpiece;
An uncut processing step for holding the cutout of the work piece on the work piece by a welded portion formed by melting a part of the wire electrode in at least one place of a work shape;
At least move the upper head part without moving the lower head part , or move the lower head part without moving the upper head part, and the upper head part and the lower head part the positional relationship of the time of processing and the moving step for moving the process to different states,
Wire discharge including a separation step of separating the cutout from the workpiece above the workpiece by jetting liquid from the lower head portion, and the recovery portion collecting the cutout above the workpiece. Processing method. The upper head portion or the lower head portion has a function of jetting liquid at the time of the cutout. And
  In the separation step, the upper head portion or the lower head portion is moved forward by the function. The wire electric discharge machining method according to claim 1 or 2, wherein the cutout is separated by jetting a liquid. Law. A wire electrical discharge machining method for cutting a workpiece in a wire electrical discharge machining apparatus,
The wire electrical discharge machining apparatus is
An upper head portion located above the workpiece via a wire electrode;
A lower head portion located at a lower portion of the workpiece via the wire electrode;
A separation part fixed to the lower head part and having a cylinder function;
A recovery unit for recovering the cutout separated on the upper side of the workpiece;
An uncut processing step for holding the cutout of the work piece on the work piece by a welded portion formed by melting a part of the wire electrode in at least one place of a work shape;
A moving step of moving the separating unit and the lower head unit to move the separating unit under the cutout ;
Wire discharge including a separation step in which the separation unit separates the cutout from the workpiece to the upper side of the workpiece by a cylinder stroke that raises the cylinder, and the recovery unit collects the cutout on the upper side of the workpiece. Processing method. 5. The wire electric discharge machining method according to claim 2, wherein the collection unit sucks and collects the cutout on an upper side of the workpiece. 6. In the separation step, wherein performs process for supplying the wire electrode, wherein said cut-out thereof by contact detection of the wire electrode is determined whether or not removed, the wire electric discharge machining method according to any one of claims 1 to 5 . The wire electric discharge machining method according to any one of claims 1 to 6 , wherein, in the separation step, the separation portion performs the cylinder stroke again when the cylinder stroke does not penetrate the workpiece. Wire electric discharge machining method according to any one of claims 1 to 7, including a finishing step of finishing after separation of the cutout thereof. A wire electric discharge machining apparatus for cutting a workpiece,
An upper head portion located above the workpiece via a wire electrode;
A lower head portion located at a lower portion of the workpiece via the wire electrode;
A control unit for controlling the position of the upper head unit, the lower head unit and the workpiece;
The workpiece cut out is held on the workpiece by a welded portion formed by melting a part of the wire electrode in at least one place of the processed shape of the workpiece,
The control unit moves the upper head unit without moving the lower head unit , or moves the lower head unit without moving the upper head unit, and moves the upper head unit and the lower head unit. Make the positional relationship with the head part different from that during processing,
The said upper head part is a wire electric discharge machining apparatus which isolate | separates the said cutout from the said workpiece to the lower side of the said workpiece | work by jetting a liquid after a movement. A wire electric discharge machining apparatus for cutting a workpiece,
An upper head portion located above the workpiece via a wire electrode;
A lower head portion located at a lower portion of the workpiece via the wire electrode;
A recovery section for recovering the cutout separated on the upper side of the workpiece;
A control unit for controlling the position of the upper head unit, the lower head unit and the workpiece;
The workpiece cut out is held on the workpiece by a welded portion formed by melting a part of the wire electrode in at least one place of the processed shape of the workpiece,
The control unit moves the upper head unit without moving the lower head unit , or moves the lower head unit without moving the upper head unit, and moves the upper head unit and the lower head unit. Make the positional relationship with the head part different from that during processing ,
The lower head portion, after changing the positional relationship, separates the cutout from the workpiece by jetting a liquid to the upper side of the workpiece,
The said collection | recovery part is a wire electric discharge machining apparatus which collect | recovers the said cutouts isolate | separated in the upper side of the said workpiece. A wire electric discharge machining apparatus for cutting a workpiece,
An upper head portion located above the workpiece via a wire electrode;
A lower head portion located at a lower portion of the workpiece via the wire electrode;
A separation part fixed to the lower head part and having a cylinder function;
A recovery section for recovering the cutout separated on the upper side of the workpiece;
A control unit for controlling the position of the upper head unit, the lower head unit and the workpiece;
The workpiece cut out is held on the workpiece by a welded portion formed by melting a part of the wire electrode in at least one place of the processed shape of the workpiece,
The control unit moves the separation unit and the lower head unit to move the separation unit below the cutout ,
The separation unit separates the cutout from the workpiece on the upper side of the workpiece by a cylinder stroke that raises the cylinder after the positional relationship is changed,
The said collection | recovery part is a wire electric discharge machining apparatus which collect | recovers the said cutouts isolate | separated in the upper side of the said workpiece.