JP4569975B2 - Automatic wire-cutting device for wire-cut electrical discharge machine - Google Patents

Description

  The present invention relates to an automatic connection device for a wire-cut electric discharge machining apparatus that automatically connects and stretches a wire electrode between a pair of wire guides. In particular, the connection nozzle is mounted on the machining liquid jet nozzle so as to seal the opening of the machining liquid jet nozzle, and is propelled while restraining the wire electrode with the jet supplied from the connection nozzle and guided to the lower wire guide. The present invention relates to an automatic connection device.

  A wire-cut electric discharge machining apparatus having a numerical control device automatically passes a wire electrode through a pair of upper and lower wire guides, and the wire electrode passing through the wire guide is captured by a winding roller so that the wire electrode is moved up and down. It is equipped with an automatic connection device that performs so-called automatic connection that connects and stretches between them.

  In general, an automatic connection device supplies water or a water-based electric discharge machining liquid containing water as a main component coaxially to the wire electrode delivery direction, and propels the wire electrode while restraining the wire electrode with the jet. The electrode is guided directly or through a pilot hole drilled in the workpiece to the lower wire guide. In particular, a method of guiding a wire electrode only by a jet from an upper wire guide to a lower wire guide typically shown in Patent Document 1 is called a jet method. A method of guiding a wire electrode by a guide pipe and a jet supplied into the guide pipe up to an inlet of a prepared hole or a lower wire guide typically shown in Patent Document 2 is called a pipe jet method.

  The jet type automatic connection device is simpler in configuration and operation than the pipe jet type automatic connection device. In addition, since a diamond die guide (round die guide) can be used for the wire guide, in taper machining in which the wire electrode is inclined with respect to the workpiece, the taper angle error is small and high accuracy. There is.

  In the machining fluid jet supplied as the machining medium from the machining fluid jet nozzle, there is not enough force to propel the wire electrode, which is free at the tip, to move straight, so the wire electrode is caught in the pilot hole or machining groove and seated. Bow. Therefore, the jet type automatic connection device includes a connection nozzle that supplies a high-pressure jet for connection to form a water column having an outer diameter smaller than the outer diameter of the water column of the processing liquid jet in the upper guide assembly. It is provided coaxially with the jet nozzle.

  Since the wire electrode that has passed through the upper wire guide needs to be constrained by the water column of the jet for connection, the connection nozzle is arranged directly below the upper wire guide so that the opening portion surrounds the upper wire guide. Is provided. Therefore, there is a considerable distance from the height position of the opening portion of the connection nozzle to the height position of the opening portion of the machining liquid jet nozzle. The farther away from the connection nozzle opening, the smaller the restraining force that restrains the wire electrode of the jet and the propulsive force that propels it, and turbulence is likely to occur. However, there is a high probability that the connection will be missed.

  In particular, when a wire electrode having a small outer diameter and extremely low rigidity is used, it becomes more difficult to guide the wire electrode only with a jet for connection. Alternatively, when the wire electrode is inserted into a pilot hole with a small inner diameter or a machining groove formed by machining, the clearance between the wire electrode and the pilot hole or machining groove is small, and the inner diameter of the pilot hole or the groove width of the machining groove Even if the outer diameter of the water column is slightly larger than the water column, the water column is disturbed at the inlet of the pilot hole or the machining groove, and the tip of the wire electrode is not correctly guided to the pilot hole or the machining groove, and the wire electrode is not processed. It often gets caught in and fails to connect.

  In addition, the upper guide assembly interferes with the workpiece and the opening portion of the machining liquid jet nozzle is set at the inlet of the pilot hole, as in the case where the machining surface has a step or the pilot hole is drilled in the stepped hole. In the case where the distance from the nozzle for connection to the pilot hole is too long, the wire electrode cannot be sufficiently restrained only by the jet for connection, and the wire electrode is inserted into the pilot hole. Is extremely difficult.

  For this reason, the jet type automatic wire connection device disclosed in Patent Document 3 extends the wire connection nozzle downward and processes the opening portion of the wire connection nozzle as much as possible without obstructing the supply of the machining liquid jet. It is arranged at a height position near the opening part of the liquid jet nozzle, and the distance from the nozzle for connection to the pilot hole is shortened to improve the success rate of automatic connection.

  However, in the jet type automatic connection device having an extended connection nozzle, if the taper angle is increased when performing taper processing, the distance from the upper wire guide to the opening portion of the connection nozzle is increased, so that it is inclined. Since the wire electrode interferes with the connection nozzle, taper processing with a relatively large taper angle, for example, processing with a taper angle of 15 degrees or more, so-called large taper processing cannot be performed.

  In the improved automatic jet connection device, as shown in Patent Document 4 or Patent Document 5, the nozzle for connection is coaxially moved up and down coaxially with the wire electrode delivery path which is the direction in which the jet for connection is ejected. It can be moved back and forth. When performing automatic connection, the connection nozzle is lowered so that the opening portion of the connection nozzle is at a height position relatively close to the opening portion of the machining liquid jet nozzle, and when processing is performed, the opening portion of the connection nozzle The connection nozzle is raised so that is at a height position close to the upper wire guide.

  Therefore, the improved automatic jet connection device of the jet system is such that when automatic connection is performed, the distance from the connection nozzle to the pilot hole is shortened so that the success rate of automatic connection is not reduced. The distance from the guide to the opening portion of the connecting nozzle is shortened so that the limit taper angle at which taper processing can be performed is increased.

  However, the outer diameter of the water column needs to be sufficiently small in order to ensure the restraining force and propulsive force of the wire electrode and to prevent the water column in the jet for connection at the entrance of the pilot hole from being disturbed. Therefore, since the inner diameter of the connection nozzle cannot be increased, it is still difficult to perform large taper processing. In addition, the lower limit height position at which the connection nozzle can be lowered is always above the opening of the machining fluid jet nozzle so as not to obstruct the supply of the machining fluid jet. It is not expected to improve. And in the case where the upper guide assembly interferes with the workpiece, it is still difficult to insert the wire electrode into the prepared hole.

  The pipe jet type automatic connection device lowers the guide pipe until the opening portion of the guide pipe is close enough to be in close contact with the inlet of the pilot hole, so that there is an excellent advantage that the automatic connection hardly fails. In addition, since the tip of the guide pipe can be lowered to the inlet of the pilot hole beyond the opening of the machining fluid jet nozzle, the jet method can be used regardless of the shape of the workpiece. This is advantageous compared to the automatic connection device. Since the guide pipe is raised above the upper guide assembly during machining, the wire electrode inclined with the upper wire guide as a fulcrum has no obstacles other than the machining liquid jet nozzle, which is practically effective. Within the range, there is substantially no limit to the taper angle in taper machining.

  However, since the pipe jet type automatic connection device needs to lower the guide pipe through at least the upper wire guide, it is possible to open the through hole (guide hole) of the wire guide when lowering the guide pipe. It is necessary to use a split guide that can be used (split die guide). Since the split die guide is low in durability and easily worn, positioning accuracy cannot be maintained for a long time. In addition, the split die guide has a larger positioning error than the round die guide due to its structure. In particular, the split die guide has a disadvantage in that the taper angle error in taper machining is large and the machining accuracy is inferior compared to the round die guide.

  For this reason, it is difficult to perform large taper machining with high machining accuracy in any of the jet method and the pipe jet method. Therefore, for example, as shown in Patent Document 6, Patent Document 7, and Patent Document 8, only when automatic connection is performed, the connection nozzle is used as a machining liquid jet nozzle so as to seal the opening portion of the machining liquid jet nozzle. A type of automatic connection device to be worn is considered. Hereinafter, the method of attaching the connection nozzle to the machining fluid jet nozzle from the outside and performing automatic connection is referred to as a sub-nozzle attachment method.

  In the sub-nozzle-equipped automatic connection device, there is no connection nozzle in the upper guide assembly. Therefore, the inclined wire electrode has no obstacles other than the machining liquid jet nozzle, and there is no limitation on the practical taper angle. Further, since the opening portion of the connection nozzle can be arranged at a height close to the close contact with the entrance of the pilot hole, the success rate of automatic connection is as high as the pipe jet method. On the other hand, since it is not necessary to lower the guide pipe beyond the upper wire guide as in the pipe jet method, a round die guide can be used for the upper wire guide, and the positioning accuracy is excellent.

  In addition, in the automatic connection device of the sub nozzle mounting method, the connection nozzle having a smaller outer diameter than the machining liquid jet nozzle is mounted on the machining liquid jet nozzle so as to protrude downward from the machining liquid jet nozzle. Since the opening part of the nozzle for connection can be made close to the inlet of the pilot hole without bringing the opening part of the jet nozzle close to the inlet of the pilot hole, there is no problem even when the upper guide assembly interferes with the workpiece. Connections can be made.

Japanese Patent No. 3406647 Japanese Patent Publication No. 7-29246 JP-A-63-3318219 Japanese Patent Publication No. 5-53567 Japanese Patent Publication No. 6-39013 Japanese Patent Publication No. 5-21693 Japanese Laid-Open Patent Publication No. 2-100824 JP-A-4-269121

  The sub-nozzle mounting automatic connection device has the advantage of eliminating the disadvantages of the jet automatic connection device and the pipe jet automatic connection device, but each time automatic connection is performed, the connection nozzle is automatically processed. A connecting nozzle attaching / detaching device for attaching / detaching to / from the liquid jet nozzle is required.

  Since high-pressure water is supplied from the machining liquid jet nozzle to the connection nozzle having an inner diameter smaller than that of the machining liquid jet nozzle, the load due to the internal pressure of the high-pressure water applied to the connecting portion between the connection nozzle and the machining liquid jet nozzle is large. For this reason, if the connection nozzle is simply attached to be pressed against the machining liquid jet nozzle, the connection nozzle is pushed back by the pressure of the high-pressure water and separated from the machining liquid jet nozzle. Further, if the connecting portion between the connection nozzle and the machining liquid jet nozzle is not strong, there is a risk that the connection nozzle or the machining liquid jet nozzle may be damaged without being able to withstand the load caused by the pressure of the high-pressure water.

  High pressure water has low durability against load and tends to concentrate in areas where the coupling force and seal are weak, so if water begins to leak due to a gap in the connection area between the connection nozzle and machining fluid jet nozzle The leak expands all at once, leading to a high-pressure water jet. When a large amount of water is ejected, the restraint force and propulsive force by the jet for connection are remarkably reduced, or the water column is disturbed and automatic connection cannot be performed. In addition, water splashes around and is applied to the worker, or contaminates the periphery of the processing tank.

Therefore, the connecting nozzle attaching / detaching device engages the threading nozzle with the machining liquid jet nozzle so that the wiring nozzle does not disengage from the machining liquid jet nozzle due to the pressure of high-pressure water. A fixing member such as a tool is interposed to be firmly coupled. When the connection nozzle is attached to or removed from the machining fluid jet nozzle, the connection nozzle attaching / detaching device requires a high degree of operation in the method of engaging, screwing, and connecting with the fixing member. The configuration of the automatic connection device including the nozzle attaching / detaching device and the control device is complicated. Further, it takes too much time to attach the connection nozzle, and the time required for automatic connection is significantly longer than that of the jet type or pipe jet type.

  In addition, since it is necessary to completely close and seal the opening part of the machining liquid jet nozzle with the connection nozzle, the connection nozzle and the machining liquid are used so that no looseness occurs at the connecting portion between the connection nozzle and the machining liquid jet nozzle. The jet nozzle is required to be precisely manufactured. A moving device that can perform highly accurate positioning control with an optical component such as a position sensor may be provided so that the position of the connection nozzle with respect to the machining liquid jet nozzle is not shifted and the connection fails. In addition, it is required that the component parts of the connection nozzle such as the seal member be made of a material that hardly changes over time.

  In particular, after the wire electrode is connected and stretched, it is necessary to remove the connection nozzle from the machining liquid jet nozzle and move it to a retracted position that does not interfere with setup work or processing. It is necessary to be able to remove it from the machining liquid jet nozzle, but it is difficult to connect the divided parts obtained by dividing the connection nozzle accurately and combine them so that they are firmly and liquid-tightly coupled to the machining liquid jet nozzle. The nozzle for use may come off from the machining fluid jet nozzle, and the connection may fail or high-pressure water may scatter.

  Thus, in the automatic connection device of the sub-nozzle mounting method, it takes too much time to attach and detach the connection nozzle, and the time required for automatic connection becomes unacceptably long with the current technical level. In addition, the connection nozzle and the machining liquid jet nozzle are only slightly displaced from each other, and the connection nozzle cannot collide with the machining liquid jet nozzle to be coupled, and the operation is often interrupted. Also, the work is often interrupted by breakage and damage to the components of the connection nozzle. As a result, the sub-nozzle mounting method has a disadvantage that the working efficiency is too low as compared with the jet method and the pipe jet method.

  Further, the sub-nozzle mounting type automatic connection device is relatively difficult to manufacture and mass-production of the connection nozzle and the machining liquid jet nozzle. Further, the configuration of the automatic connection device including the attachment / detachment device for the connection nozzle and the control device is relatively complicated. In addition, a position sensor and a moving device that achieve accurate positioning may be required. For this reason, the sub-nozzle mounting method currently has a low cost effect due to the excessive cost of the automatic connection device that is an accessory unit of the wire-cut electric discharge machining device.

  For this reason, the automatic connection device of the sub-nozzle mounting method can solve the problems that cannot be solved by the jet method and the pipe jet method, but in practice, the disadvantages outweigh the advantages, The reality is that they are not actively employed.

  The present invention is an automatic connection device of a sub nozzle mounting type, in which a connection nozzle is automatically used as a machining liquid jet nozzle in a liquid-tight manner so that the connection nozzle is not separated from the machining liquid jet nozzle with a relatively simple configuration and operation. It is a main object of the present invention to provide an improved automatic connection device of a sub-nozzle mounting system that can be combined and mounted. Some advantages of the automatic connection device of the present invention will be described in detail along with the description of the best mode for carrying out the invention.

  The automatic wire-cutting apparatus of the wire-cut electric discharge machine of the present invention is divided into two equal parts so that the nozzle for connection (20) is cut in the direction (1A) for jetting the wire for connection in the automatic-wiring device of the sub-nozzle mounting type. And a fitting groove (25) or fitting protrusion having a shape corresponding to the annular protrusion (48) or the annular groove formed over the entire outer peripheral surface of the machining fluid jet nozzle (40). The first divided body (20R) formed on the upper inner peripheral surface (24) of the outer frame (23) without interruption, and the other divided body of the connection nozzle (20), the first divided body (20R). ) And the second divided body (20L) in which the same fitting groove (25) or annular protrusion is formed on the upper inner peripheral surface (24) of the outer frame (23), and the first divided body (20R) The first finger (60R) and the second divided body (20L) that support the A support member (60) composed of a second finger (60L) to be held, and a direction orthogonal to the dividing surface of each divided body (20R, 20L) of the first finger (60R) and the second finger (60L). The first divided body (20R) and the second divided body (20L) and the second divided body (20L) and the second divided body (20L) are combined or divided at the same time. 20L) and an opening / closing device (70) that couples or separates the machining fluid jet nozzle (40), and a connecting nozzle desorbing device (7).

  In the automatic wire-bonding device of the wire-cut electric discharge machine according to the present invention, the first divided body (20R) corresponds to a portion that forms the chamber (22) of the wire-connection nozzle (20) of the outer frame (23). The upper dividing surface (23U) on the upper side of the outer frame is provided with a mountain-shaped protrusion (26) or a trough-shaped groove (27) without interruption in a direction perpendicular to the radial direction (1C) of the connection nozzle (20). The second divided body (20L) has a shape that matches the chevron ridge (26) or the trough groove (27) provided on the first divided body (20R) on the upper divided surface (23U) on the upper side of the outer frame. A valley-shaped groove (27) or a mountain-shaped protrusion (26) is provided without interruption.

  Preferably, the first divided body (20R) is connected to the connecting nozzle (20 on the lower divided surface (23B) on the lower side of the outer frame corresponding to the portion forming the connecting nozzle body (21) of the outer frame (23). ) In the direction perpendicular to the radial direction (1C), the ridges (26) or the troughs (27) are provided without interruption, and the second divided body (20L) is divided into a lower part below the outer frame. The surface (23B) is provided with a trough-shaped groove (27) or a chevron-shaped protrusion (26) having a shape matching the chevron-shaped protrusion (26) or the trough-shaped groove (27) without interruption.

  Specifically, the attachment / detachment device (7) moves the connection nozzle (20) to swing between the rear portion of the main body (10) of the automatic connection device (1) and the opening portion of the machining liquid jet nozzle (40). Device (80).

Further, switchgear (70) is characterized by opening and closing the first finger and (60R) and a second finger (60L) by pivoting reciprocating around a same fulcrum (60Z).

  Preferably, the position where the wire connection nozzle (20) is attached is the front end part, and the rear end part of each of the first finger (60R) and the second finger (60L) is connected from the front end part of the opening / closing device (70). The central axis (90C) in the transverse direction perpendicular to the longitudinal axis perpendicular to the central axis (90C) passing through the rear end portion and perpendicular to the direction (1A) of jetting with respect to the central axis (90C) A semicircular cutout (61) that opens in a direction away from the head (1E) is formed, and the opening / closing device (70) is in a direction opposite to the turning direction (1F) of the first finger (60R) (1G) in the opposite direction (1G) to the turning direction (1F) of the first arm (72R) and the second finger (60L) for turning the first finger (60R) by turning back and forth. Turn back and forth When the first arm (72R) and the second arm (72L) are swung in a direction approaching the central axis (90C), the side surfaces of the second arm (72L) turn the finger (60L). The first arm (72R) and the second arm (72L) are separated from the central axis (90C) by moving while rotating in contact with the edge of the notch (61) and moving each finger (60R, 60L) backward. When turning in the direction, a part of the side surface touches the edge of the notch (61) and moves while rotating to push and close each finger (60R, 60L) forward to close the edge of the straight part of the notch (61) And an open / close arm (72) having a cylindrical member that opposes the force in the direction in which the fingers (60R, 60L) open.

  Preferably, the annular protrusion (48) or the annular groove is formed over the entire outer peripheral surface of the nozzle cap (46) of the machining liquid jet nozzle (40).

  In the sub-nozzle mounting method, high-pressure water is supplied downward from the machining liquid jet nozzle to the connection nozzle. Since the connection nozzle is mounted on the lower side of the machining liquid jet nozzle, a downward force is applied to the connection nozzle in the direction in which the connection nozzle is detached from the machining liquid jet nozzle due to the internal pressure of the high-pressure water. In addition, since high-pressure water is supplied from the machining fluid jet nozzle having a large inner diameter to the connection nozzle having a small inner diameter, the high-pressure water introduced into the connection nozzle is located inside the connection nozzle in the radial direction of the connection nozzle. Load radially to expand from.

  The automatic wire connection device of the present invention has an annular ridge in the horizontal direction perpendicular to the downward direction in which high-pressure water is supplied to the wire connection nozzle, that is, in the radial direction of the wire connection nozzle. Alternatively, since the annular groove (hereinafter referred to as only the annular ridge) and the fitting groove having a shape corresponding to the annular ridge (or the fitting ridge when corresponding to the annular groove) are fitted together, the pressure of the high-pressure water Due to this, the fitting groove is pressed downward against the fitting protrusion and is brought into close contact therewith. As a result, since the connection nozzle is fixed to the machining liquid jet nozzle, the connection nozzle is hardly separated from the machining liquid jet nozzle, and high-pressure water does not leak out.

  Therefore, the connecting portion between the connection nozzle and the machining liquid jet nozzle can be configured only by the annular protrusion and the fitting groove, the structure of the combined portion is simple and durable, and the connection nozzle and the machining fluid jet nozzle There is no risk of damage, improving safety. Further, since the joint portion is sealed with the pressure of high-pressure water, a component such as a seal member is not necessarily required, and the manufacturing cost of the connection nozzle is reduced. And since there are few component parts which are easy to deteriorate over time with a comparatively simple structure, the durability and liquid-tightness of the connection part are not immediately lost, and safety is improved.

  In addition, since the automatic connection device of the present invention is configured to seal the gap between the annular ridge and the fitting groove with the pressure of high-pressure water, the play is provided between the annular ridge and the fitting groove. Even if there is a misalignment between the divided parts of the connection nozzle and the machining liquid jet nozzle, the possibility that the connection nozzle cannot be coupled to the machining liquid jet nozzle is small. Therefore, the connection nozzle and the machining fluid jet nozzle do not require higher precision than necessary.

  And since the annular protrusion and the fitting groove are fitted in the direction of the horizontal plane orthogonal to the downward direction in which the high-pressure water is supplied to the connection nozzle, each divided body is moved from the direction orthogonal to the dividing surface to the machining liquid jet nozzle. They can be combined, and can be combined with the machining liquid jet nozzle simultaneously with the combination of the respective divided bodies. The method of coupling by fitting can make the configuration of the automatic connection device and the control device easier than the method of coupling by engagement, screwing, and fixing member, and the manufacturing cost is reduced. In addition, since the operation for attaching and detaching the connection nozzle is relatively simple and the number of processes is reduced, the attachment and detachment time of the connection nozzle is shortened, and the time required for automatic connection is not disadvantageous compared to the jet method and the pipe jet method. Can be shortened within the range.

  The configuration in which the chevron ridges and the valley grooves of the shape matching the chevron ridges are formed opposite to each other on the dividing surface of each divided body of the connection nozzle is combined. Therefore, misalignment between the divided bodies is absorbed. Therefore, the joining nozzles and the machining liquid jet nozzle are more reliably coupled by simultaneously combining the divided bodies and coupling the machining liquid jet nozzle. As a result, work is not interrupted and workability is improved. In addition, since the positioning accuracy when combining the divided bodies is not required to be excessively high, the manufacturing cost of the connecting nozzle and the manufacturing cost of the automatic connecting device are reduced.

  And, since the split body is united by fitting the mountain-shaped protrusions and the valley-shaped grooves in the direction perpendicular to the radial direction of the connecting nozzle, the internal pressure of the high-pressure water is radial in the radial direction of the connecting nozzle. As a result, the ridges are pressed against the valley grooves in the radial direction, and the gaps between the ridges and the valley grooves are closed. For this reason, leakage of high-pressure water from between the divided bodies is reliably prevented with a simple configuration.

  As described above, according to the automatic wire connection device of the present invention, since the operation of connecting the wire connection nozzle and the machining liquid jet nozzle is simple, the attachment / detachment time of the wire connection nozzle can be greatly shortened in the sub nozzle mounting method. Further, since there is play between the annular protrusion and the fitting groove, the connection between the wire connection nozzle and the machining liquid jet nozzle does not fail, and the workability is improved. In addition, since the coupling portion is composed only of the annular protrusion and the fitting groove, the structure is simple and durable, and there is no fear of damage to the component parts. As a result, the working efficiency and safety are improved.

  In addition, according to the automatic connection device of the present invention, it is possible to provide play between the annular protrusion and the fitting groove, and it becomes particularly difficult to manufacture the machining liquid jet nozzle as compared with the jet method and the pipe jet method. There is nothing. In addition, since the configuration and operation in the connection between the connection nozzle and the machining liquid jet nozzle are simple, the configuration of the automatic connection device and the control device can be simplified. Further, since there is play between the annular ridge and the fitting groove, a high-quality optical component and a moving device that can perform highly accurate positioning are unnecessary. As a result, there is an effect that the manufacturing cost of the automatic connection device in the sub-nozzle mounting method is reduced to the extent that it is not disadvantageous to the jet method and the pipe jet method.

  When the attachment / detachment device has a moving device that swings the wire connection nozzle between the rear portion of the main body of the automatic wire connection device and the opening portion of the machining liquid jet nozzle, the wire connection nozzle is moved from the retracted position to the mounting position in one stroke. Since it can be moved, the operation when attaching / detaching the connection nozzle is simpler and the number of processes is further reduced, the attachment / detachment time of the connection nozzle is short, and the time required for automatic connection can be further reduced. Therefore, there is an effect that the working efficiency is further improved.

  When the opening and closing device is configured to open and close by turning and reciprocating a pair of fingers around the same fulcrum, each segment of the connection nozzle can be simultaneously moved in opposite directions by one operation. Thus, it is possible to smoothly combine the divided bodies in a short time with a relatively simple configuration. Further, the positional deviation between the divided bodies and between the divided bodies and the machining liquid jet nozzle is reduced. Therefore, there is an effect that the working efficiency is further improved.

  When the rear end portion of each finger is formed with a semicircular cutout on the head, and the opening and closing arm is pivoted so that the cylindrical member pivots while rotating in contact with the edge of the notch, The fingers can be simultaneously swung in opposite directions by the linear reciprocating motion of the driving device of the opening / closing device so as to be opened / closed, and the uniting of the connection nozzles can be held. Therefore, even if the driving force of the opening / closing device driving device that holds the divided members against each other is small, separation of each divided member can be prevented, and the connecting device mounting / detaching device for the connection nozzle can be reduced by downsizing the opening / closing device driving device The manufacturing cost is further reduced, and the safety is improved.

  Since the automatic connection device of the present invention is a sub-nozzle mounting method, since there is no connection nozzle or split wire guide in the upper guide assembly, the configuration of the upper guide assembly is simple compared to the jet method or the pipe jet method, Production costs are reduced. In the case where the annular ridge is formed over the entire outer peripheral surface of the nozzle cap of the machining liquid jet nozzle, there is no change in the configuration of the machining liquid jet nozzle other than the nozzle cap, so that the production cost can be further reduced. Moreover, even if the configuration of the upper guide assembly is changed, it is possible to mount the connection nozzle only by replacing the nozzle cap.

  FIG. 1 is a schematic diagram showing wiring of a wire cut electric discharge machining apparatus. Hereinafter, the outline of the overall configuration of the wire-cut electric discharge machining apparatus and the automatic connection apparatus will be described by limiting to the main apparatuses and members shown in FIG. FIG. 1 shows a state where the connection nozzle is attached to the machining liquid jet nozzle, and the connection nozzle attaching / detaching device is not shown.

  The main body 10 of the automatic wire connection device 1 is provided on a machining head that moves in the direction of one vertical axis. An attachment / detachment device for the connection nozzle 20 is provided in the main body 10. An upper guide assembly 30 is fixedly attached to the lower end of the main body 10. The height position of the upper guide assembly 30 can be adjusted by raising and lowering the machining head and moving the main body 10 in the vertical direction.

  A machining fluid jet nozzle 40 is provided in the upper guide assembly 30. The machining liquid jet nozzle 40 assembled in the upper guide assembly 30 supplies the machining liquid jet so that the water column surrounds the wire electrode 2 coaxially with the feeding direction of the wire electrode 2. The machining liquid jet nozzle 40 supplies a machining liquid jet as a machining medium downward toward a machining site of the workpiece 3 installed below the upper guide assembly 30.

  The wire electrode 2 is fed out from the wire bobbin 44 loaded on the reel by the tension roller 42 of the delivery mechanism 4. The tension roller 42 also serves as a feed roller, and during processing, the tension roller 42 sends the wire electrode 2 to the processing site while applying a required tension to the wire electrode 2 with the winding roller. The wire electrode 2 fed out from the wire bobbin 44 is inserted into the upper wire guide provided in the upper guide assembly 30 and the prepared hole drilled in the workpiece 3 by the automatic connection device 1.

  The wire electrode 2 inserted into the lower hole is guided to a pipe jet type conveying device 54 by a direction changing pulley 52 of the recovery mechanism 5 through a lower wire guide (not shown) provided in the lower guide assembly 50. . The conveying device 54 conveys the wire electrode 2 by a water flow while guiding the wire electrode 2 to the winding roller of the discharging device 56 with a pipe. The discharge device 56 includes a cutting roller having a winding roller and a rotating cutting blade made up of a driving roller and a capstan. The discharge device 56 captures and winds up the used wire electrode 2 used for processing with a winding roller, cuts it with a cutting roller, and discharges it to the bucket 58.

  The automatic connection device 1 includes a guide pipe 12, a jet supply unit 14 that supplies a jet for guiding the wire electrode 2 to the guide pipe 12, a feed roller 16, a cutter 18, and a connection nozzle 20. Further, the automatic wire connection device 1 includes an elevating device that moves the guide pipe 12 up and down in the direction in which the wire electrode 2 is sent out.

  The automatic wire-bonding device 1 can be provided with a tip processing device that carries out and collects the cut pieces of the wire electrode 2 including the cutter 18 and cut by the cutter 18. The cutter 18 can be replaced with an energizing / cutting device that locally supplies a large current to the wire electrode 2 and cuts it. Further, the automatic wire connection device 1 can be provided with an annealing device (not shown) for annealing the wire electrode 2. The annealed wire electrode 2 is imparted with straightness and becomes difficult to buckle.

  The guide pipe 12 can be lowered by the elevating device until the opening portion is located immediately above the upper wire guide. When automatic connection is performed, the guide pipe 12 guides the wire electrode 2 to the upper wire guide while preventing the wire electrode 2 from buckling by the jet supplied from the jet supply unit 14 and inserts the tip of the wire electrode 2 into the upper wire guide. . During processing, the guide pipe 12 is raised to the upper limit position so that the opening portion is positioned higher than the cutter 18.

  FIG. 2 shows a cross section of the automatic connection device of the present invention as viewed from the left side of the connection nozzle and the machining fluid jet nozzle in the preferred embodiment, the left side of the drawing is the front side of the machine, and the right side of the drawing is the machine. It is the back side. FIG. 2 shows a state where the connection nozzle is attached to the machining fluid jet nozzle. In FIG. 2, the connecting nozzle attaching / detaching device is not shown.

  The automatic connection device 1 of the present invention is a jet for connection that is supplied from the connection nozzle 20 by mounting the connection nozzle 20 on the processing liquid jet nozzle 40 so as to seal the opening portion of the processing liquid jet nozzle 40. This is a sub-nozzle mounting type automatic connection device for guiding the wire electrode 2.

  The upper guide assembly 30 is attached and fixed to the upper arm 6 provided on the lower end side of the main body 10 of the automatic connection device 1. The upper guide assembly 30 is made of an upper wire guide 31 that positions and guides the wire electrode 2 and a flat-plate cemented carbide alloy (tungsten carbide) that contacts the wire electrode 2 and supplies electric power for processing. This is an assembly in which the upper conductive body 32 and the machining liquid jet nozzle 40 are integrated into and out of the housing 33.

  The upper wire guide 31 is a diamond round die guide. A round die guide has higher positioning accuracy than other types of wire guides, and is particularly excellent in taper machining. The upper wire guide 31 is surrounded by the machining fluid jet nozzle 40 so that the wire electrode 2 is positioned and guided as close as possible to the machining site of the workpiece 3 and is in the water column of the machining fluid jet. It is provided at a position close to the opening portion of the machining liquid jet nozzle 40. Therefore, the wire electrode 2 stretched between the upper and lower wire guides can be inclined to an angle that interferes with the machining liquid jet nozzle 40 having a wide opening, and a large taper machining can be performed with high machining accuracy.

  In the automatic connection device 1 shown in FIGS. 1 and 2, the lower end of the guide pipe 12 can be lowered to just above the upper wire guide 31. When the guide pipe 12 is configured to descend directly above the upper wire guide 31, the upper current-carrying body 32 is automatically slid away from the delivery path of the wire electrode 2 in order to allow passage of the guide pipe 12. It can be moved.

  The machining liquid jet nozzle 40 has an opening portion that opens downward toward the workpiece 3, and the lower part of the upper guide assembly 30 is injected so that the machining liquid jet is jetted coaxially with the feeding direction of the wire electrode 2. It is integrated and assembled on the side. The nozzle cap 46 is fixed to the housing 33 by screwing. The nozzle cap 46 and the housing 33 form a processing liquid jet chamber 47.

  Specifically, the connection nozzle 20 receives the high pressure water supplied from the connection nozzle main body 21 for injecting a jet for connection in the delivery direction of the wire electrode 2 and the machining liquid jet nozzle 40 for connection. A chamber 22 for feeding water to the nozzle body 21 and an outer frame 23 that forms a housing of the connection nozzle 20 to form the connection nozzle body 21 and the chamber 22. The direction 1A in which the jet for connection is ejected is coaxial with the delivery direction of the wire electrode 2 and is downward in which the workpiece 3 and the lower wire guide assembly 50 are installed. It is perpendicular to the installation surface.

  An annular ridge 48 is formed over the entire circumference of the outer peripheral surface of the machining liquid jet nozzle 40 in the direction of a plane orthogonal to the direction 1B in which high-pressure water is supplied from the machining liquid jet nozzle 40, in short, in the horizontal direction. . In the machining liquid jet nozzle 40 shown in FIG. 2, an annular protrusion 48 is provided over the entire outer peripheral surface of the nozzle cap 46. In the automatic connection device of the sub-nozzle mounting type of the present invention, there is basically no restriction on the configuration of the upper guide assembly 30 except for the nozzle cap 46 for automatic connection. Therefore, the configuration of the upper guide assembly is simple with respect to the jet type or pipe jet type automatic connection device, and the production cost is not disadvantageous.

  A fitting groove 25 having a shape corresponding to the annular ridge 48 formed in the machining liquid jet nozzle 40 on the upper inner peripheral surface 24 of the outer frame 23 of the connection nozzle 20 faces the annular ridge 48 without interruption. Is formed. The connection nozzle 20 is coupled to the machining liquid jet nozzle 40 by fitting the annular protrusion 48 and the fitting groove 25. When the connection nozzle 20 is attached to the machining liquid jet nozzle 40, the upper inner peripheral surface 24 of the outer frame 23 of the connection nozzle 20 and the outer peripheral surface of the tip portion of the machining liquid jet nozzle 40 are matched. The annular protrusion 48 is not limited to a literal circular ring, but is a polygonal ring when the machining liquid jet nozzle 40 has a polygonal outer shape.

  The method of connecting and connecting the connection nozzle to the machining fluid jet nozzle is simpler than the method of engaging, screwing, or connecting with a fixing member, and the operation of attaching and detaching the connection nozzle is simple. There is an advantage that the configuration of the automatic connection device including the attachment / detachment device for the connection nozzle and the control device can be simplified. In addition, it can deform | transform so that an annular protrusion may be formed in the nozzle 20 for a connection, and the fitting groove of the shape corresponding to an annular protrusion may be formed in the process liquid jet nozzle 40. FIG.

  A play (clearance) is provided between the annular protrusion 48 and the fitting groove 25. By providing a clearance between the annular protrusion 48 and the fitting groove 25, the connection nozzle 20 can be coupled to the machining liquid jet nozzle 40 without the annular protrusion 48 and the fitting groove 25 being engaged with each other with a slight positional deviation. It will not disappear.

  In the connection nozzle 20 and the machining fluid jet nozzle 40 shown in FIG. 2, the annular protrusion 48 is triangular or trapezoidal in cross section and has an inclined surface, and the cross section in which the fitting groove 25 is aligned with the annular protrusion 48. Are triangular or trapezoidal and have an inclined surface. For this reason, the fitting groove 25 is guided and fitted to the inclined surface of the annular ridge 48, so that there is no clearance between the annular ridge 48 and the fitting groove 25. The misalignment between and is absorbed.

The high-pressure water is supplied to the chamber 22 of the connection nozzle 20 along the direction 1B in which the high-pressure water is supplied from the machining liquid jet nozzle 40, and is supplied to the connection nozzle body 21 through the chamber 22. The direction 1B in which the high-pressure water is supplied is the same downward direction as the direction 1A in which the jet for connection is ejected. Since the fitting groove 25 is pressed downward against the annular protrusion 28 by the downward force due to the pressure of the high-pressure water, the connection nozzle 20 does not come off due to the pressure of the high-pressure water. Is coupled to the machining liquid jet nozzle 40, and the opening portion of the machining liquid jet nozzle 40 is hermetically sealed.

  The connection nozzle 20 is cut from the center in the direction 1A in which the jet for connection is ejected, in other words, vertically divided into two equal parts, and is divided left and right from the front of the main body 10 of the automatic connection device 1. Is the structure. One divided body of the right half (the left side of the connection nozzle) viewed from the front when the connection nozzle 20 is divided into two equal parts is defined as a first divided body 20R, and the other half of the left half (the right side of the connection nozzle) viewed from the front. The divided body is a second divided body 20L.

  In the first divided body 20R, the connection nozzle 20 is connected to the upper division surface 23U on the upper side of the outer frame corresponding to the portion forming the chamber 22 of the connection nozzle 20 of the connection frame 20 constituting the housing of the connection nozzle 20. In the direction orthogonal to the radial direction 1C, in other words, in the direction 1A in which the jet for connection is ejected, the mountain-shaped protrusion 26 or the valley-shaped groove 27 is provided without interruption. Further, the second divided body has an angled ridge 26 or a valley so as to face the angled ridge 26 or the valley groove 27 provided on the first divided body 20R on the upper divided surface 23U on the upper side of the outer frame. A trough-shaped groove 27 or a chevron-shaped protrusion 28 having a shape matching the shaped groove 27 is provided without interruption.

  In the connection nozzle 20 shown in FIG. 2, each of the divided bodies 20 </ b> R and 20 </ b> L that are vertically divided from the center has two divided surfaces on the outer frame 23, and is connected to one divided surface. A chevron 26 is formed in the clockwise direction along the outer frame 23 around the axis coaxial with the direction 1A in which the jet for jetting is jetted, and the other split surface is anticlockwise along the outer frame 23 A trough groove 27 is formed.

  Therefore, when high-pressure water is supplied to the connection nozzle 20, the internal pressure of the high-pressure water is radially applied to the radial direction 1 </ b> C of the connection nozzle 20, so that the ridges 26 are pressed against the valley grooves 27 in the radial direction. As a result, the chevron 26 and the trough 27 are engaged with each other, and a slight gap between the chevron 26 and the trough 27 is closed. As a result, since the positions of the first divided body 20R and the second divided body 20L do not shift, it is difficult to separate them, and the respective divided surfaces can be liquid-sealed with an internal pressure of high-pressure water and sealed more reliably. .

  The chevron ridge 26 is a ridge having a triangular or trapezoidal cross section and an inclined surface. The trough groove 27 has a shape that matches the chevron ridge 26. The mountain-shaped protrusion 26 and the valley-shaped groove 27 are in a positional relationship that faces each other so that the divided bodies 20R and 20L are fitted together when they are combined on the dividing surface. Since the valley-shaped groove 27 is guided and fitted to the inclined surface of the ridge 26, when the divided bodies 20R, 20L and the machining liquid jet nozzle 40 are combined, the first divided body 20R and the second divided body 20R. The positional deviation of the body 20L is absorbed. Therefore, the union of the divided bodies 20R and 20L and the combination of the divided bodies 20R and 20L and the machining liquid jet nozzle 40 are performed smoothly at the same time, so that the connection nozzle 20 can be completely attached to the machining liquid jet nozzle 40. .

  In this way, the connection nozzle 20 uses the pressure of high-pressure water that acts in a direction to separate the first divided body 20R, the second divided body 20L, and the machining liquid jet nozzle 40 of the connection nozzle 20. Thus, the connection nozzle 20 and the machining fluid jet nozzle 40 are coupled and the coupled portion is sealed. Therefore, the high connectivity, liquid tightness, and ease of coupling of the connection nozzle 20 are compatible with a relatively simple configuration.

  In the connection nozzle 20 shown in FIG. 2, the first divided body 20 </ b> R includes the connection nozzle 20 on the lower division surface 23 </ b> B below the outer frame corresponding to the portion of the outer frame 23 that forms the connection nozzle main body 21. In the direction perpendicular to the radial direction 1C, the ridges 26 or the troughs 27 are provided without interruption. Further, the second divided body 20L includes a valley-shaped groove 27 having a shape aligned with a mountain-shaped protrusion 26 or a valley-shaped groove 27 provided on the first divided body 20R on the lower divided surface 23B on the lower side of the outer frame. The Yamagata protrusion 28 is provided without interruption.

  When the first divided body 20R and the second divided body 20L are joined, the chevron ridges 26 and the valley grooves 27 are fitted to each other on the upper divided surface 23U on the upper side of the outer frame. The ease of bonding is sufficiently obtained. However, since the connecting nozzle 20 shown in FIG. 2 fits the ridges 26 and the valley grooves 27 on the lower divided surface 23B on the lower side of the outer frame, This has the advantage that the liquid-tightness at the site can be increased and sealing can be performed more reliably.

  FIG. 3 is a left side view showing an enlarged main part of a preferred embodiment of the automatic connection device of the present invention, the left side of the drawing is the front side, and the right side of the drawing is the back side. FIG. 3 shows a state where the connecting nozzle attaching / detaching device moves the connecting nozzle to the mounting position and the connecting nozzle is attached to the machining liquid jet nozzle. FIG. 4 is a perspective view seen from the back side of the main body of the automatic connection device, showing an enlarged main part of the preferred embodiment of the automatic connection device. FIG. 4 shows a state in which the connection nozzle is accommodated by the connection nozzle attaching / detaching device moving the connection nozzle to the retracted position.

  The attachment / detachment device 7 for the connection nozzle 20 includes a support member 60 composed of a first finger 60R for supporting the first divided body 20R and a second finger 60L for supporting the second divided body 20L, and a support member 60. FIG. 3 shows a retracting position 10A in the rear portion of the main body 10 of the automatic connection device 1 shown in FIG. 4 together with the opening and closing device 70 and the opening and closing device 70 and the connection nozzle 20 supported by the support member 60. And a moving device 80 that moves between the mounting position 10 </ b> B immediately below the opening portion of the machining liquid jet nozzle 40.

  The support member 60 and the opening / closing device 70 are provided integrally, and constitute the main body unit 90 including the connection nozzle 20 attached to the support member 60. In the main unit 90 shown in FIGS. 3 and 4, the constituent members of the opening / closing device 70 are visible. However, in implementation, a cover that covers the constituent members of the opening / closing device 70 is provided, and the constituent members are fixed to the cover. It is made not to fall off.

  The moving device 80 of the attachment / detachment device 7 in the automatic connection device according to the embodiment automatically connects the connection nozzle 20 composed of the first divided body 20R and the second divided body 20L supported by the support member 60 together with the opening / closing device 70. A swing movement is performed in the rotational direction 1D between a retracted position 10A in the rear portion of the main body 10 of the connection device 1 and a mounting position 10B immediately below the opening portion of the machining liquid jet nozzle 40. Since the connection nozzle 20 can be moved from the retracted position 10A to the mounting position 10B in one stroke, there is an advantage of reducing the time required for automatic connection.

  Specifically, the moving device 80 is like a pendulum around one horizontal axis in the X-axis direction with the swing bracket 81 attached to the main body 10 of the automatic connection device 1 and the main body unit 90 using the mounting position 80X of the swing blanket 81 as a fulcrum. And a link mechanism 83 that converts the linear reciprocating motion of the driving device 82 into the rotational reciprocating motion of the main body unit 90 and transmits it.

  The drive device 82 is a cylinder device such as an air cylinder or a hydraulic cylinder that operates with compressed air supplied from an air source such as a compressor (not shown) or pressurized oil supplied from an oil tank. The drive device 82 is housed so that the cylinder tube is vertically arranged in a recessed groove portion 10C provided in the rear portion of the main body 10 of the automatic connection device 1 shown in FIG.

  When the drive device 82 lowers the piston of the cylinder device to the lower limit position, the first link 83V of the link mechanism 83 directly connected to the piston rod moves downward, and one end is connected to the first link 83V with a joint in FIG. The second link 83W of the link mechanism 83 shown in FIG. 5 pushes up the main body unit 90 supported by the swing blanket 81 and swings the connection nozzle 20 to the retracted position 10A. When raising the piston to the upper limit position, the first link 83V moves upward, and the second link 83W pulls down the main body unit 90 to swing the connection nozzle 20 to the mounting position 10B.

  When the retracting position 10A of the main unit 90 is provided in the rear portion of the main body 10 of the automatic connection device 1, in the movement method based on a combination of linear movements, a plurality of strokes are required to move the connecting nozzle from the retracting position 10A to the mounting position 10B. It is necessary to move via. Since the moving device 80 shown in FIG. 4 is configured to be able to swing the connection nozzle 20, the connection nozzle 20 is positioned from the retracted position 10 </ b> A to the mounting position 10 </ b> B in a single stroke following the turning movement locus. be able to. Therefore, the main unit 90 can be accommodated in the back portion 10A that does not become an obstacle to work or processing without giving a significant loss to the time required for automatic connection.

  5 and 6 are perspective views showing a main unit including a connection nozzle in a preferred embodiment of the automatic connection apparatus of the present invention. FIG. 5 shows a state where the support member is opened and the connection nozzle is divided. FIG. 6 shows a state in which the support member is closed and the connection nozzles are combined.

  In the following description, for convenience, regardless of the mounting state of the support member 60 and the opening / closing device 70, the position where the connection nozzle 20 is mounted is the front side (front) of the main unit 90, and the pair of fingers 60R, 60L The tip part. And let the direction of a front-end | tip part be the front along the center axis line 90C which passes along a rear-end part from the front-end | tip part of the main body unit 90 containing the opening / closing apparatus 70 shown by FIG.

  The direction perpendicular to the central axis 90C along the direction 1A in which the jet for connection is ejected is the vertical direction, the direction perpendicular to the central axis 90C and perpendicular to the vertical axis is the horizontal direction, and the center A direction 1E away from the axis 90C in the lateral direction is defined as the outside. Further, the surface parallel to the central axis 90C and perpendicular to the longitudinal axis is set as the mounting plane, the surface parallel to the mounting plane and positioned in the direction 1A in which the jet for connection is jetted is the lower surface (back side), and the jet is jetted The surface located in the direction opposite to the direction 1A is referred to as the upper surface (surface).

In closing device 70 of the removable device 7 in the automatic wire connection device of the embodiment, the moving device 80 is configured to position the mounting position 10A the connecting nozzle 20 is moved swing body unit 90 at one stroke In order to arrange the connection nozzle 20 coaxially with the machining fluid jet nozzle 40 at the mounting position 10B, the connection nozzle 20 is attached to be inclined with respect to the mounting plane of the main unit 90, as shown in FIG. ing. Therefore, although the longitudinal axis of the main unit 90 is not exactly parallel to the direction 1A in which the jet for connection is ejected, the longitudinal axis and the direction 1A in which the jet for connection are ejected are It is described as being parallel.

  The first finger 60R and the second finger 60L are opened and closed by a so-called double-open double-closing method in which the first finger 60R and the second finger 60L move in directions opposite to each other in a direction orthogonal to the divided surfaces of the divided bodies 20R and 20L. Specifically, the first finger 60R and the second finger 60L swivel in opposite directions around one axis in the vertical direction parallel to the direction 1A in which the jet for connection is jetted around the same fulcrum 60Z. Move back and forth.

  The rear end portions of the first finger 60R and the second finger 60L are orthogonal to the central axis 90C passing through the rear end portion from the front end portion of the main body unit 90 including the opening / closing device 70 and perpendicular to the longitudinal axis. A semicircular cutout 61 having a head shape that opens in the direction 1E away from the central axis 90C is formed in the lateral direction. Therefore, the notch 61R provided in the first finger 60R and the notch 61L provided in the second finger 60L open in opposite directions. By the notch 61, the rear end portion of each finger 60R, 60L is formed in a bowl shape.

  The opening / closing device 70 opens and closes the first finger 60R and the second finger 60L by moving the first finger 60R and the second finger 60L in directions opposite to each other in a direction perpendicular to the dividing surfaces of the divided bodies 20R and 20L of the connection nozzle 20. The opening / closing device 70 opens and closes the pair of fingers 60R and 60L at the mounting position 10B to merge or divide the first divided body 20R and the second divided body 20L, and at the same time, the first divided body 20R and the second divided body 20L. The divided body 20L and the machining liquid jet nozzle 40 are coupled or separated.

  Specifically, the opening / closing device 70 has a direction in which the first finger 60R and the second finger 60L are orthogonal to the dividing surface of each of the divided bodies 20R and 20L around the same fulcrum 60Z around one longitudinal axis. Are opened and closed by reciprocating in the opposite directions in the turning direction 1F on the mounting plane.

  The pair of fingers 60R, 60L in the attachment / detachment device 7 for the connection nozzle 20 pivots and reciprocates in opposite directions around the same fulcrum 60Z to open and close the first split body at the mounting position 10B. It is possible to combine or separate the first divided body 20R, the second divided body 20L, and the machining liquid jet nozzle 40 at the same time as combining or dividing the 20R and the second divided body 20L.

  Therefore, the automatic connection device 1 shown in the figure can attach and detach the connection nozzle 20 and the machining liquid jet nozzle 40 in one operation, reducing the number of steps for attaching and detaching the connection nozzle 20 and requiring automatic connection. It is effective in that the time can be shortened. Further, the configuration of the main unit 90 shown in FIGS. 5 and 6 is important in that it enables the connecting nozzle 20 to be swung between the retracted position 10A and the mounting position 10B.

  The opening / closing device 70 includes a driving device 71 that is a cylinder device that linearly reciprocates in a single longitudinal direction 90Y parallel to the central axis 90C of the main body unit 90, and a longitudinal one so as to open and close the pair of fingers 60R and 60L. An opening / closing arm 72 composed of a pair of arms that simultaneously rotate in opposite directions in the turning direction 1G on the mounting plane around the axial direction, and a linear reciprocating motion in the one-axis direction 90Y of the drive device 71, the turning direction 1G of the opening / closing arm 72 And a conversion joint 73 for converting into the rotational reciprocating motion.

The drive device 71 is a cylinder device formed of an air cylinder that operates with compressed air supplied from an air source (not shown). The air cylinder is advantageous in that a necessary and sufficient force can be applied in the direction in which the divided bodies 20R and 20L of the wire connection nozzle 20 are joined together against the pressure of high-pressure water compared to the size.

  Specifically, the open / close arm 72 reciprocates around a single axis in the vertical direction in the turning direction 1G opposite to the turning direction 1F on the same mounting plane as the turning direction 1F of the first finger 60R. Turning the first finger 60R in the turning direction 1F, the first arm 72R on the right side from the front, and the turning opposite to the turning direction 1F on the same mounting plane as the turning direction 1F of the second finger 60L It consists of a second arm 72L on the left side from the front side that reciprocates in the direction 1G and revolves around one axis in the vertical direction to turn the second finger 60L in the turning direction 1F.

  Each of the arms 72R and 72L of the opening / closing arm 72 has a roller-like cylindrical member 74 that holds the combined nozzle 20 for connection. When the open / close arm 72 pivots in the pivot direction 1G, the cylindrical member 74 has a cylindrical central axis along the edges of the semicircular cutouts 61 formed at the rear ends of the pair of fingers 60R and 60L. Move while rotating around. The diameter of the cylindrical member 74 is smaller than the diameter of the semicircular arc portion of the notch 61.

  As shown in FIG. 5, when the open / close arm 72 turns in the turning direction 1G approaching the central axis 90 </ b> C, a part of the side surface of the cylindrical member 74 rotates in contact with the edge formed in the bowl shape of the notch 61. Move while. Therefore, the arms 72R and 72L attempt to pull down the fingers 60R and 60L to the rear of the main unit 90, so that the fingers 60R and 60L are separated from the central axis 90C opposite to the turning direction 1G around the fulcrum 60Z. It turns in the turning direction 1F and is pulled open. As a result, the connection nozzle 20 is divided into a first divided body 20R and a second divided body 20L.

  On the other hand, as shown in FIG. 6, when the open / close arm 72 turns in the turning direction 1G away from the central axis 90 </ b> C, a part of the side surface of the cylindrical member 74 contacts the edge of the notch 61 and moves while rotating. . Therefore, the arms 72R and 72L try to push up the fingers 60R and 60L to the front of the main unit 90, respectively, so that the fingers 60R and 60L approach the central axis 90C opposite to the turning direction 1G around the fulcrum 60Z. It turns in the turning direction 1F and is pushed closed. As a result, the connection nozzle 20 is combined.

  When the pair of fingers 60R and 60L are pushed and closed, a part of the side surface of the cylindrical member 74 stops on the edge of the straight portion of the notch 61 so as to push it forward of the main body unit 90. At this time, the first arm 72 </ b> R and the second arm 72 </ b> L are in a state where the arms are stretched and stretched in front of the main unit 90.

  Since the cylindrical member 74 is stopped so as to push forward on the edge of the straight portion of the notch 61, simply applying a linear force acting in the opening direction by pushing back the pair of fingers 60R and 60L, The cylindrical member 74 does not move in the direction approaching the central axis C, and is half locked. When each arm 72R, 72L extends at a right angle or an angle close to a right angle with respect to the edges of the straight portions of the cutouts 61R, 61L, the connection nozzle 20 due to the internal pressure of the high-pressure water should be expanded. Is transmitted to the opening / closing arm 72 in the direction of the longitudinal axis of the opening / closing arm 72 that is substantially parallel to the one-axis direction 90Y in which the cylinder device of the driving device 71 reciprocates linearly, and is paired to be pushed down. The fingers 60R and 60L are supported by both arms so as not to move.

  In the illustrated opening / closing device 70, when the pair of fingers 60 </ b> R and 60 </ b> L are closed, the cylinder internal pressure of the cylinder device of the drive device 71 is changed to the piston so that the conversion joint 73 is positioned in front of the main body unit 90. Therefore, the connection of the connection nozzle 20 is held by the force of compressed air against the force of high-pressure water that attempts to separate the connection nozzle 20.

  Accordingly, the cylindrical member 74 attached to the distal end of the opening / closing arm 72 is in a substantially locked state against the force in the direction in which the fingers open when the connection nozzle 20 is united, and the cylinder device is compressed air. It has the effect | action which assists the holding force which hold | maintains the coupling | bonding of the nozzle 20 for a connection with this force, and the nozzle 20 for a connection is not isolate | separated. Therefore, the configuration of the support arm 60 and the opening / closing device 70 shown in FIGS. 5 and 6 can reduce the size of the cylinder device in which the driving force is roughly proportional to the size. Therefore, the size of the driving device 71 of the opening / closing device 70 can be reduced. This is advantageous in that the main body unit 90 is made compact by reducing the size and the separation of the connection nozzle 20 is prevented.

  When the connection nozzle 20 is united, the cylindrical member 74 is stopped so as to push forward at the edge of the straight portion of the notch 61, and is locked in the direction in which the pair of fingers 60R and 60L are about to open. However, since the cylindrical member 74 is configured to rotate around the central axis of the cylinder, the conversion joint 73 linearly moves rearward and pulls the opening / closing arm 72 so as to rotate in a direction approaching the central axis 90C. In some cases, the cylindrical member 74 rotates and easily moves out of the straight portion of the notch 61, so that the cylinder device can easily retract the piston and divide the connection nozzle 20.

  Naturally, in principle, the stop position of the cylindrical member 74 when the wire connection nozzle 20 is united greatly exceeds the position perpendicular to the edge of the straight portion of the notch 61, and the direction in which the open / close arm 72 moves away from the central axis 90C. If it extends too far to 1E, when the conversion joint 73 moves rearward, the open / close arm 72 does not turn in the direction approaching the center axis 90C in an attempt to turn in the direction away from the center axis 90C. Therefore, as shown in FIGS. 5 and 6, the stop position of the cylindrical member 74 when the connection nozzle 20 is combined is configured so that the open / close arm 72 always returns to the direction approaching the central axis 90 </ b> C. It is necessary, but it is not difficult to design.

  The operation of the automatic connection device of the present invention will be briefly described below with reference to FIGS. When performing automatic connection, before starting the processing, the wire electrode is passed directly or through the pilot hole and stretched through the lower wire guide, and when the wire electrode is disconnected due to an unexpected accident, the upper and lower wires are again connected. There may be a stretch between the guides. In the following, the case where the wire electrode is stretched before starting the processing will be described. It should be noted that the position of the component of the automatic connection device that operates during automatic connection when automatic connection is not performed is defined as the initial position.

  Except when performing automatic connection, the main body unit 90 of the attachment / detachment device 7 including the connection nozzle 20 is accommodated in a retracted position 10A in the rear portion of the main body 10 of the automatic connection device 1, as shown in FIG. Yes. In the automatic connection device shown in FIG. 4, when the main body unit 90 is at the retracted position 10A, the pair of fingers 60R and 60L are closed and the connection nozzle 20 is combined to prevent damage to the constituent members. It is in a state. However, in order to make the operation when mounting the connection nozzle 20 easier, the pair of fingers 60R and 60L may be opened in advance to accommodate the connection nozzle 20 in the retracted position 10A. it can.

  When automatic connection is performed, a control device (not shown) is activated based on an input from a button or switch on a control panel in a numerical control device or a touch sensor on a screen in a liquid crystal display or a command signal according to a decoded NC program. . The control device is a sequencer that operates the automatic connection device in a prescribed order.

  First, the cutter 18 is actuated to cut the wire electrode 2 so that the tips of the wire electrode 2 are aligned. When the wire electrode 2 remains in the collection mechanism 5, the winding electrode of the discharge device 56 is driven to discharge the remaining wire electrode 2 to the bucket 58. When a cut piece of the wire electrode 2 is generated, the cut piece is discharged out of the apparatus by a tip processing device (not shown).

  Next, the drive unit 82 of the moving device 80 of the attachment / detachment device 7 is actuated by a signal from the control device to push down the main body unit 90 forward. As shown in FIG. 4, when the pair of fingers 60R and 60L are closed and accommodated, the drive device 71 of the opening / closing device 70 is operated while the main body unit 90 is swinging, so that the pair of fingers The connection nozzle 20 is divided by opening 60R and 60L.

  As shown in FIG. 3, the body unit 90 of the detachable device 7 that is pushed down is supported by a swing blanket 81 that rotates in a rotational direction 1D in a pendulum manner around the X axis direction around a fulcrum 81X. The swing movement is performed in one stroke from the retreat position 10A to the mounting position 10B immediately below the opening portion of the machining liquid jet nozzle 40 in the rotation direction 1D.

  When the connection nozzle 20 is positioned at the mounting position 10B, the drive device 71 of the opening / closing device 70 in the main unit 90 is operated to advance the conversion joint 73 as shown in FIG. When the conversion joint 73 moves to the front of the main unit 90, the open / close arm 72 turns in the direction opposite to each other in the turning direction 1G toward the outside around the vertical axis.

  A part of the side surface of the cylindrical member 74 moves while contacting and rotating the edges of the notches 61R and 61L formed at the rear end portions of the fingers 60R and 60L to move the fingers 60R and 60L forward of the main body unit 90. Extrude into. Since the fingers 60R and 60L pushed forward are supported by the fulcrum 60Z, the fingers 60R and 60L have a turning direction 1F opposite to the turning direction 1G on the same mounting plane as the turning direction 1G of the opening / closing arm 72 around the fulcrum 60Z. The divided bodies 20R and 20L of the connection nozzle 20 attached so as to be opposed to the tip end part are joined together, and at the same time, the divided bodies 20R and 20L and the machining liquid jet nozzle 40 are joined.

  At this time, an annular protrusion 48 having an inclined surface is provided in the machining liquid jet nozzle 40, and the annular protrusion is formed on the upper inner peripheral surface 24 of the outer frame 23 of each divided body 20R, 20L constituting the housing of the wire connection nozzle 20. A fitting groove 25 having a shape corresponding to 48 is formed at a position facing the annular protrusion 48. Therefore, when the connection nozzle 20 is combined at the mounting position 10 </ b> A, the fitting groove 25 fits along the inclined surface of the annular protrusion 48, and the positional deviation between each of the divided bodies 20 </ b> R, 20 </ b> L and the machining liquid jet nozzle 40 occurs. By being absorbed, the divided bodies 20R and 20L are surely merged without failure, and at the same time, the divided bodies 20R and 20L are coupled to the machining liquid jet nozzle 40.

  In addition, the connection nozzle 20 is provided at least in the radial direction 1C of the connection nozzle 20 on the upper divided surface 23U on the upper side of the outer frame corresponding to the portion forming the chamber 22 of the outer frame 23 of each divided body 20R, 20L. The groove-shaped protrusion 26 and the valley-shaped groove 27 having a shape matching the angle-shaped protrusion 26 are provided without interruption so as to be fitted to each other in the orthogonal direction. Therefore, when the connection nozzle 20 is united at the mounting position 10A, the valley-shaped groove 27 is guided and fitted to the inclined surface of the mountain-shaped ridge 26 to divide the first divided body 20R and the second divided body 20L. The surfaces are precisely aligned and the split surfaces are sealed.

  As described above, in the automatic connection device according to the embodiment, the first divided body 20R and the second divided body at the mounting position 10B and the step of swinging the connection nozzle 20 from the retracted position 10A to the mounting position 10B in one stroke. And the connecting nozzle 20 is attached to the machining liquid jet nozzle 40 in only two steps, including the step of attaching the connecting nozzle 20 to the machining liquid jet nozzle 40. Further, in the automatic wire connection device according to the embodiment, the wire connection nozzle 20 is connected to and attached to the machining liquid jet nozzle 40 only by opening and closing the pair of fingers 60R and 60L. Therefore, the automatic connection device of the embodiment has a relatively simple operation and a small number of processes.

  After the connection nozzle 20 is mounted on the machining liquid jet nozzle 40, as shown in FIG. 2, the high pressure water is supplied to the connection nozzle 20 along the direction 1B in which high pressure water is supplied from the machining liquid jet nozzle 40. To do. The high-pressure water supplied to the chamber 22 is injected coaxially with the direction in which the wire electrode 2 is sent out in the direction 1A in which a jet for connection is injected from the connection nozzle body 21.

  Meanwhile, a jet is supplied to the guide pipe 12 from the jet supply unit 14 shown in FIG. Further, the upper energization body 32 shown in FIG. 2 is retracted to a position where it does not get in the way so as to be separated from the delivery path of the wire electrode 2.

The guide pipe 12 is lowered until the tip of the guide pipe 12 passes over the upper electric conductor 32 and reaches a height position just above the upper wire guide 31, and the tension roller 42 , which also serves as a feeding roller, and the wire electrode 2 feed out. The wire electrode 2 in the guide pipe 12 is sent out in cooperation with the sending roller 16 that sends it out without departing from the path.

  As shown in FIG. 2, the tip of the wire electrode 2 guided by the guide pipe 12 and passed through the upper wire guide 31 is surrounded and guided by the high-pressure water supplied along the direction 1B in which the high-pressure water is supplied. While being sent, the wire electrode feed path is maintained and the wire nozzle is fed into the connection nozzle body 21. And it is propelled while being restrained by the jet for connection, and is guided to the entrance of the pilot hole. The tip of the wire electrode 2 that has been inserted through the lower hole and passed through the lower wire guide is captured and connected to the winding roller of the discharge device 56 shown in FIG.

  When a signal indicating completion of connection is obtained by the sensor, the control device stops feeding the wire electrode 2. Further, the control device stops the supply of the jet from the jet supply unit 14 shown in FIG. 1 and raises the guide pipe 12 to the initial position where the tip of the guide pipe 12 is located above the cutter 18 and the machining liquid jet The supply of high-pressure water from the nozzle 40 is stopped.

  Subsequently, as shown in FIG. 5, the drive device 71 of the opening / closing device 70 in the main unit 90 is operated to retract the conversion joint 73 to the initial position. When the conversion joint 73 moves to the rear of the main body unit 90, the arms 72R and 72L of the open / close arm 72 turn in the opposite directions in the turning direction 1G toward the inside approaching the central axis 90C. At this time, the partial side surfaces of the cylindrical member 74 move while rotating in contact with the edges of the notches 61 formed at the rear end portions of the fingers 60R and 60L, respectively, and rotating. , 60L is pulled down to the rear of the main unit 90.

  When the fingers 60R and 60L are pulled backward, the fingers 60R and 60L are vertically moved in a turning direction 1F opposite to the turning direction 1G that is narrowed inward so that the open / close arm 72 approaches the center axis 90C around the fulcrum 60Z. The divided bodies 20R and 20L of the connection nozzle 20 which are opened by turning in opposite directions around one axis in the direction and opened so as to face the tip portion are divided.

  Then, the cylinder device of the driving device 82 of the moving device 80 is operated to pull up the main unit 90 backward. As shown in FIG. 3, the main body unit 90 lifted rearward is supported by a swing blanket 81 that rotates in a rotational direction 1D in a pendulum-like manner around the X-axis direction around a fulcrum 81X. From 10B to the retreating position 10A in the rear portion of the main body 10 of the automatic connection device 1 in the rotation direction 1D, the swing movement is performed at a stroke in one stroke.

  The wire electrode 2 has already been moved up and down since the wire electrode 2 has already been connected at the time when the wire connection nozzle 20 is separated from the machining fluid jet nozzle 40, removed, and moved in a swinging manner to be accommodated in the initial retracted position 10A. It is in a state of being stretched between wire guides. At this time, the connection nozzle 20 is vertically divided from the center to the left and right, and the pair of fingers 60R and 60L move in opposite directions to open and close, so each divided body 20R and 20L Can be pulled out without being caught by the wire electrode 2 stretched, and can be detached from the mounting position 10B.

  The automatic connection device according to the preferred embodiment of the present invention described above greatly corrects the difference in work efficiency and cost burden between the sub-nozzle mounting method for the jet method and the pipe jet method, and the automatic connection device of the sub-nozzle mounting method is Easy to adopt, enables large taper machining with high machining accuracy, enables the success rate of automatic wire connection to be the same as the pipe jet method, and enables automatic wire connection regardless of the shape of the work surface of the workpiece You can enjoy the benefits.

  The automatic connection device of the present invention is not limited to the configuration of the automatic connection device that is specifically illustrated and described, and as some examples have already been given, the scope does not depart from the technical idea of the present invention. It can be carried out with modification.

  The present invention is applied to a wire cut electric discharge machining apparatus. The present invention makes it possible to easily adopt a sub-nozzle type automatic connection device, and enables large taper processing with high processing accuracy. The present invention contributes to the development of wire cut electrical discharge machining by improving the work efficiency and machining accuracy of wire cut electrical discharge machining.

It is a plane schematic diagram which shows the outline | summary of the whole wire-cut electric discharge machining apparatus provided with the automatic connection apparatus of this invention. It is sectional drawing on the left side of the process liquid jet nozzle and the nozzle for connection in the automatic connection apparatus of this invention. It is a left view which shows the attachment or detachment apparatus of the nozzle for connection of the automatic connection apparatus of this invention. It is the perspective view seen from the back side of the main part which shows the attachment / detachment apparatus of the nozzle for connection of the automatic connection apparatus of this invention. It is a perspective view of a main unit showing the state where the nozzle for connection in the attachment and detachment device of the nozzle for connection of the automatic connection device of the present invention is divided. It is a perspective view of a main unit showing the state where the nozzle for connection in the attachment / detachment device for the nozzle for connection of the automatic connection device of the present invention is combined.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Automatic connection apparatus 2 Wire electrode 3 Workpiece 4 Delivery mechanism 5 Recovery mechanism 6 Upper arm 7 Connecting nozzle attachment / detachment apparatus 10 Automatic connection apparatus main body 20 Connecting nozzle 20R First divided body 20L Second divided body 23 Outer frame 23U Upper divided surface 23B Lower divided surface 24 Upper inner peripheral surface 25 Fitting groove 26 Mountain shaped ridge 27 Valley groove 30 Upper guide assembly 31 Upper wire guide 40 Work fluid jet nozzle 48 Annular ridge 50 Lower guide assembly 60 Support member 60R First finger 60L Second finger 60Z Support point 61 Notch 70 Opening and closing device 71 Drive device 72 Opening and closing arm 72R First arm 72L Second arm 73 Conversion joint 74 Cylindrical member 80 Moving device 81 Swing bracket 82 Drive Device 83 Link mechanism

Claims (7)

A wire-cut electric discharge machining apparatus that guides a wire electrode with a jet supplied from the connection nozzle by attaching the connection nozzle to the machining liquid jet nozzle so as to seal the opening portion of the machining liquid jet nozzle when performing automatic connection In the automatic connection apparatus, the annular protrusion formed on the entire outer peripheral surface of the machining liquid jet nozzle is one divided body that is divided into two equal parts so as to cut the connection nozzle in the jetting direction. Or a first divided body in which a fitting groove or a fitting ridge having a shape corresponding to the annular groove is formed on the upper inner peripheral surface of the outer frame without interruption; and the other divided body of the connection nozzle, A second divided body in which the same fitting groove or annular protrusion as the first divided body is formed on the upper inner peripheral surface of the outer frame; a first finger that supports the first divided body, and the first 2nd supporting the divided body of 2 A support member composed of fingers, the first finger and the second finger are moved in directions opposite to each other in a direction perpendicular to the dividing surface of each divided body to open and close the first divided body and the first Detachment / removal of a connection nozzle comprising: an opening / closing device that combines or separates the first divided body, the second divided body, and the machining liquid jet nozzle at the same time as combining or dividing the two divided bodies An automatic connection device having: The first divided body has an angle ridge in a direction perpendicular to the radial direction of the connecting nozzle on an upper divided surface on the upper side of the outer frame corresponding to a portion forming the chamber of the connecting nozzle of the outer frame. Alternatively, valley-shaped grooves are provided without interruption, and the second divided body has a shape that aligns with the chevron ridges or the valley-shaped grooves provided in the first divided body on the upper divided surface on the upper side of the outer frame. The automatic connection device according to claim 1, wherein the valley grooves or the ridges are provided without interruption. The first divided body has an angled ridge in a direction perpendicular to the radial direction of the connecting nozzle on a lower divided surface on the lower side of the outer frame corresponding to a portion of the outer frame forming the connecting nozzle body. Alternatively, a trough-shaped groove is provided without interruption, and the second divided body has a trough-shaped groove or a trough-shaped ridge having a shape aligned with the chevron-shaped protrusion or the trough-shaped groove on the lower dividing surface on the lower side of the outer frame. The automatic connection device according to claim 2, wherein the automatic connection device is provided without interruption. 2. The automatic connection device according to claim 1, wherein the attachment / detachment device includes a moving device that swings the connection nozzle between a rear portion of the main body of the automatic connection device and an opening portion of the machining liquid jet nozzle. . 2. The automatic connection device according to claim 1, wherein the opening and closing device opens and closes the first finger and the second finger by reciprocating revolving around the same fulcrum. With the position where the nozzle for connection is attached as a tip portion, the rear end portion of each of the first finger and the second finger is orthogonal to the central axis passing from the tip portion to the rear end portion of the switchgear. And a semicircular cut-out in the shape of a head that opens in a direction away from the central axis in the lateral direction perpendicular to the longitudinal axis perpendicular to the jet direction of the jet with respect to the central axis, The opening / closing device is opposite to the turning direction of the first arm and the second finger turning and reciprocating in a direction opposite to the turning direction of the first finger to turn the first finger. And a second arm that reciprocates in a direction to turn the second finger, and when the first arm and the second arm turn in a direction approaching the central axis, a part of the side faces forward When the first arm and the second arm pivot in a direction away from the central axis by moving while rotating in contact with the edge of the notch, the fingers move rearward, and part of the side faces A cylindrical member that contacts the edge of the notch, moves while rotating, pushes and closes each finger forward, contacts the edge of the straight portion of the notch, and opposes the force in the direction in which each finger opens; 6. The automatic connection device according to claim 5, further comprising an opening / closing arm. 2. The automatic connection device according to claim 1, wherein the annular protrusion or the annular groove is formed over the entire outer peripheral surface of a nozzle cap of the machining liquid jet nozzle.

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