JP2006224259A - Wire guide assembly and wire-cutting discharge machining apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a wire-cutting discharge machining apparatus capable of utilizing a guide system for different wire electrodes by relatively facilitating the exchange of different types of wire guides without need for removal of a guide assembly from an arm. <P>SOLUTION: The guide assembly 1 is mainly composed of a housing member 10, a wire insertion block 20, an energizing body block 30, a guide unit 40 and a nozzle cap 8 of a coaxial jet nozzle 5. The guide unit 10 has a configuration suitable to a structure of the wire guide 4. A mounting hole 12 is formed in a lower surface of the housing member 10. The guide unit 40 is fitted into the mounting hole 12 so that the inside diameter of the mounting hole 12 may meet the outside diameter of an upper member 41 of the guide unit 40, which are mounted on the housing member 10 so as to enclose the guide unit 40 with the nozzle cap 8. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a guide assembly having a configuration in which a guide unit can be easily replaced without removing a wire guide assembly from an arm. The present invention also relates to a wire-cut electric discharge machining apparatus that has the guide assembly and includes an automatic connection device.

  Wire-cut electrical discharge machining can cut a conductive workpiece into a desired machining shape with a machining accuracy of tens of μm or less. If wire-cut electric discharge machining is performed in a required environment using a wire-cut electric discharge machining apparatus with specifications for precision machining, machining accuracy of about 1 μm can be obtained.

  In order to process the workpiece, since it is necessary to stretch the wire electrode perpendicularly to the direction of cutting the workpiece, a pair of wire guides are provided with the workpiece interposed therebetween. The wire guide is guided while positioning a wire electrode that is applied with a predetermined tension and is fed out from the wire bobbin. Since the wire electrode vibrates not a little, it is advantageous to reduce the distance between the wire guides (guide span) as much as possible because the maximum amplitude of the vibration of the wire electrode can be reduced and the machining error can be reduced. . Therefore, it is preferable to provide the pair of wire guides as close to the workpiece as possible.

  In order to perform wire-cut electric discharge machining, an electric current must be supplied to the wire electrode, so that an electric current supplying power to the wire electrode is required. In order to efficiently supply a current to the wire electrode, generally, the energization bodies are provided in pairs with the workpieces interposed therebetween. The shorter the distance from the machining power source to the machining gap, the smaller the energy loss due to resistance between the lines, and the lower the rise of the discharge current pulse by reducing the inductance component in the discharge circuit. Can be steep. Therefore, the pair of electric conductors are provided as close to the machining gap as possible.

  In wire-cut electric discharge machining, a machining fluid is used as a machining medium. The machining fluid supplied to the machining gap restores the insulation necessary for spark discharge that contributes to machining, cools the wire electrode and the workpiece or the machining gap, and eliminates machining debris from the machining gap. Therefore, there is a need for a jet nozzle that applies pressure to the machining liquid to form a machining liquid jet and supplies the machining liquid jet to the machining gap. In order to reliably supply the machining fluid through the small machining gap and further enhance the effect of the machining fluid, the machining fluid jet is supplied along the traveling direction of the wire electrode stretched between the pair of wire guides, and It is known that it is better to spray and supply from a position as close to the machining gap as possible. Therefore, the jet nozzle is a so-called coaxial jet nozzle that can position the opening at a position close to the surface of the workpiece and supplies the machining liquid jet in a direction coaxial with the direction in which the wire electrode travels. Is preferred.

  For this reason, through many improvements to date, the current general wire cut is configured so that the wire electrode is stretched in the vertical direction, sent out from one side, and wound up and collected from the other. In the electric discharge machining apparatus, a path through which the wire electrode travels is provided, and a structure of a wire guide assembly in which an electrical conductor, a wire guide, and a jet nozzle that are indispensable for wire-cut electric discharge machining are integrated is adopted along the path. ing.

  The guide assembly is attached to a tip portion of an arm fixed to the head or column. When the coaxial jet nozzle is disposed so that the opening of the coaxial jet nozzle is located in the vicinity of the surface of the workpiece, a high-pressure working fluid jet is ejected from the opening, so that the guide assembly receives a strong reaction force. Therefore, the guide assembly is firmly attached and fixed to the arm.

  By the way, when performing wire-cut electric discharge machining, a wire electrode must be stretched between a pair of wire guides before machining, but in many wire-cut electric discharge machining apparatuses, the wire electrode is automatically connected and stretched. An automatic connection device is provided that can do this. When the wire electrode is stretched between a pair of wire guides, the wire electrode is passed through one wire guide through the passage on the delivery side guide assembly, and the other wire is passed through the opening of the coaxial jet nozzle of the collection side guide assembly. The tip of the wire electrode is captured by the winding device and connected through the guide. In a case where a die of a mold is machined, the wire electrode through one of the wire guides is inserted into a machining start hole (preparation hole) provided in a part (core) where the workpiece is unnecessary. Through the other wire guide.

  Among the methods for guiding the wire electrode when passing the wire electrode through a pair of wire guides, the method adopted in many automatic wire connection devices is coaxial with the direction in which the wire, such as a machining fluid, is sent out. In this method, the wire electrode is guided from one wire guide to the other wire guide by propelling the wire electrode and propelling it while restraining the wire electrode with a liquid jet. In particular, a method of guiding only the jet from the outlet of one wire guide to the other wire guide is called a jet method. A system that guides the entrance to the machining start hole or the other wire guide by a guide pipe and a jet supplied into the guide pipe is called a pipe jet system.

  The configuration of a jet type automatic connection device is typically disclosed in Patent Document 1, for example. The jet method has a problem that it is difficult to pass the wire electrode through the wire guide. In particular, a wire electrode having a diameter of 0.1 mm or less that has a smaller rigidity may be buckled at the entrance of the wire guide. Also, machining that requires the wire electrode to pass through the machining start hole, especially the case of machining a workpiece with a relatively large thickness, the case where the difference between the diameter of the machining start hole and the diameter of the wire electrode is small, or coaxial In the case where the opening of the jet nozzle cannot be brought into close contact with the surface of the workpiece, it is difficult to insert the wire electrode into the machining start hole.

  The configuration of a pipe jet type automatic connection device is typically disclosed in Patent Document 2, for example. In the pipe jet method, the tip of the guide pipe is moved at least to the entrance of the machining start hole and the wire electrode is guided by the guide pipe and the jet, so that the wire electrode can be easily passed through the machining start hole. Cannot pass through such a wire guide. For this reason, a wire-cut electric discharge machining apparatus equipped with an automatic connection device adopting a pipe jet system employs a wire guide such as a split guide so that a passage for moving the guide pipe can be formed.

  Known as a pair of wire guides that position and guide a wire electrode with a workpiece sandwiched between them are a die guide (round die guide), a split guide (split die guide), a V-groove guide, a boat guide, and a roller guide. Dice guides and split guides are often used. Previously, the die guide had a structure formed of a hard material such as a super hard material having a through hole (guide hole) having an inner diameter substantially equal to the diameter of the wire electrode. Is composed of a guide body formed of a wear-resistant material such as diamond or sapphire and a support body that supports the guide body, and a clearance of about several μm to several tens of μm between the guide body and the wire electrode ( A structure having a gap) is generally used.

  Since the die guide has no clearance or is small, high positioning accuracy can be obtained. In addition, since an ultra-hard wear-resistant member such as diamond can be used for the guide body, the life is relatively long, replacement work can be reduced, or running cost can be kept low. However, if the through hole of the die guide is enlarged to allow the guide pipe to pass through, the clearance becomes large and positioning accuracy that satisfies the requirements cannot be obtained. Therefore, the wire guide equipped with the pipe jet type automatic connection device is used for the die guide. It cannot be used for electrical discharge machining equipment.

  The split guide is basically composed of two guide members made of a hard material. When the two guide members are joined, a die-shaped through hole is formed at the joint portion of the two guide members. Therefore, since the through hole can be opened as necessary, a passage for moving the guide pipe can be formed. However, due to the structure of the split guide, in which at least one of the two guide members moves to open and close the through hole, the manufacturing cost tends to be higher than that of the die guide, and as a wear resistant material Since it is difficult to use diamond, the service life tends to be shorter than that of a die guide. Further, it has been found that the structure of the split guide is disadvantageous for a taper machining with a relatively large angle of 15 degrees (π / 12 rad.) Or more, so-called large taper machining.

  As described above, the jet method and the pipe jet method have advantages and disadvantages. For example, when it is difficult to perform automatic connection by the jet method, it is advantageous to perform automatic connection by the pipe jet method. In other processes, it is advantageous to perform automatic connection by the jet method. Further, as described above, when performing large taper processing, it is advantageous to perform automatic connection by a jet method in which a die guide can be used, and in other processing, automatic connection can be performed by a pipe jet method. It is advantageous.

  However, since it is not realistic to mount two types of automatic wire connection devices with different methods for guiding wire electrodes in one machine, an example in which a wire-cut electric discharge machining device of such a model is actually sold. Is not seen. If the two types of automatic connection devices are configured to be completely replaced, the machine will become larger and the cost will be significantly higher, so although the jet method and the pipe jet method have advantages and disadvantages, they are profitable. Does not fit.

  The biggest difference between the jet method and the pipe jet method is around the wire guide and coaxial jet nozzle (including the jet nozzle for automatic connection). It is possible to use the pipe jet method properly. However, since the guide assembly is equipped with a wire guide that requires positioning accuracy, the mounting accuracy of the guide assembly must be high and the arm must be firmly fixed to the tip of the arm. As a result, the operator cannot easily do it on site. Note that it is conceivable to apply a configuration of a device for exchanging a guide assembly such as the device disclosed in Patent Document 3. However, providing a device having such a configuration replaces two automatic connection devices in a complete manner. It cannot be said that it is an exceptional advantage over the composition.

Moreover, since the wire guide which is a consumable is provided so that replacement | exchange is possible, it is possible to replace | exchange only a wire guide. A configuration for exchanging the wire guide is disclosed in Patent Document 4, for example. However, since the basic structure of the die guide that is firmly fitted and the split guide that can be opened and closed by sliding are largely different around the wire guide and the coaxial jet nozzle, it can be exchanged as it is with the same standard. However, even if a replaceable configuration is designed, the configuration must be complicated, and there is a risk that the wire guide replacement will be more complicated than the current situation. .
Japanese Patent No. 3406647 Japanese Patent Publication No. 29246 Japanese Patent Application Laid-Open No. 8-118851 (FIG. 2) JP-A-3-121723 (page 1 to page 3)

  Thus, it would be desirable to simply replace a wire guide, especially different types of wire guides, without removing the guide assembly from the distal end of the arm. If the automatic connection method of the jet method and the pipe jet method can be used relatively easily corresponding to the purpose of processing, the width that can be processed by one wire-cut electric discharge machine greatly increases. However, as described above, there is currently no practical means for easily selecting and using the jet method and the pipe jet method on site.

  In view of the above problems, the present invention provides a wire guide assembly in which a wire guide, particularly a different type of wire guide, for example, a die guide and a split guide can be replaced relatively easily without removing the main body from the arm. The purpose is to do. Another object of the present invention is to provide a wire-cut electric discharge machining apparatus capable of performing different wire electrode guide systems, particularly jet system and pipe jet system automatic connection methods, with an easy and simple configuration. .

  Specifically, a means for solving the problems of the present invention is that a passage (2) through which a wire electrode passes is provided, and a current jet (3), a wire guide (4), and a coaxial jet along the passage (2). In the wire guide assembly (1) incorporating the nozzle (5), the guide unit (40) for holding the wire guide (4) and the outer shape of the guide unit (40) are fitted on the surface facing the guide unit (40). The body housing member (10) in which the mounting hole (12) having a matching inner shape is formed, and the inner shape of the mounting hole (12) and the outer shape of the guide unit (40) are fitted in the mounting hole (12). The nozzle cap of the coaxial jet nozzle (5) attached to the housing member (10) so as to enclose the guide unit (40) between the guide unit (40) and the housing member (10). A flop (8), which is comprising at guide assembly a.

  In the wire guide assembly, the lower end portion (72) is inserted in a state where the upper end portion protrudes into a groove (100) or a long hole (600) provided in the guide unit (40), and the wire guide assembly is provided in the current-carrying body block (30). It includes a pin (7) into which the upper end portion is inserted into a hole (32) corresponding to the groove (100) or the long hole (600). The guide unit (40) includes an upper portion having an outer shape that fits with the inner shape of the mounting hole (12) and a lower portion that holds the wire guide (4). More specifically, the guide unit (40) includes an upper member (41) having an outer shape that fits with the inner shape of the mounting hole (12), and a die guide (4A) or a split guide (4B) as the wire guide (4). ) And a lower member (42) that constitutes a jet nozzle for automatic connection or supports the split guide (4B) from the lower side. Preferably, the guide assembly includes a current-carrying body block (30) provided with a current-carrying body (3) that feeds power to the wire electrode in the housing member (10) so as to be movable in a direction perpendicular to the direction in which the wire electrode is stretched. ).

  Also, a cutting device (91) that has the guide assembly and cuts the wire electrode, a guide pipe (6) that is provided so as to be movable in the direction in which the wire electrode is stretched, and a cutting device. And a fluid supply member (92) for supplying a jet into the guide pipe (6) that restrains the wire electrode cut by (91) and imparts straightness to the wire electrode. (9) Is a wire-cut electric discharge machining apparatus.

  In the wire cut electric discharge machining apparatus, one of the guide unit (40A) in which the wire guide (4) is a die guide (4A) and the guide unit (40B) in which the wire guide (4) is a split guide (4B) is a wire guide. It is configured to be selectively attachable to the assembly (1). Note that the reference numerals in parentheses coincide with the reference numerals in the drawings referred to in the description of the embodiments, but the present invention is not limited to the specific configurations shown in the drawings.

  In the present invention, a mounting hole having an inner shape that fits the outer shape of the guide unit is formed on a surface (a lower surface in the case of an upper guide assembly) of the main body housing member of the guide assembly that faces the guide unit. For this reason, the guide unit that holds the wire guide is held in the same shape as the upper member of the guide unit that holds the different types of wire guides, for example, and the guide unit that includes the type of wire guide that is desired to be used is fitted. Can be set accurately. Therefore, regardless of the type of wire guide, for example, a die guide or a split guide, difficult alignment and mounting work are not required, and the wire guide can be exchanged by the same mounting method. As a result, with a relatively simple configuration, an operator can easily and accurately exchange different types of wire guides on site, and a plurality of wire guides can be used according to the purpose, and work efficiency is improved. There is an effect.

  In addition, the guide unit is attached so as to be pressed against the housing member, and the nozzle cap of the coaxial jet nozzle is attached and fixed so as to enclose the guide unit between the housing member and the guide unit and the nozzle cap are removed. The wire guide can be exchanged simply by attaching to it, and at the same time, the entire structure of the guide assembly can be made suitable for the type of wire guide. At this time, the main body of the automatic connection device has the same configuration regardless of the type of wire guide to be attached. As a result, large-scale equipment and work are not required, and the operator can easily and accurately replace different types of wire guides at the site, so that a plurality of automatic connection methods, such as a jet type, can be performed with the same wire-cut electric discharge machine. The pipe jet type can be used properly, and the width that can be processed by one wire cut electric discharge machining apparatus is greatly increased.

  FIG. 1 is a configuration of a preferred embodiment of a wire guide assembly of a wire cut electric discharge machining apparatus according to the present invention, and shows a state when a guide unit is removed. 2 to 4 show a configuration when the guide unit is attached. 5 and 6 show the configuration of the guide unit. The configuration of the guide assembly of the wire-cut electric discharge machining apparatus according to the present invention is particularly useful for the guide assembly on the delivery side in which the automatic connection device is provided, out of the pair of guide assemblies. In addition, the present invention provides a wire-cut electric discharge machining apparatus configured to horizontally install a workpiece, place a pair of wire guides above and below the workpiece, and move the wire electrode from the upper side to the lower side. Most suitable. Accordingly, the upper wire guide assembly will be described below as a specific example with reference to FIGS. For the entire configuration of the wire cut electric discharge machining apparatus, conventionally known techniques are referred to.

  As shown in FIG. 1, the wire guide assembly 1 (upper side) is provided with a passage 2 through which a wire electrode (not shown) passes, and an electric conductor 3, a wire guide 4, and a coaxial jet nozzle 5 are incorporated along the passage 2. . The guide assembly 1 mainly includes a main body housing member 10, a wire insertion block 20, an energizing body block 30, and a guide unit 40.

  The wire insertion block 20 is integrally fixed to the upper side of the main body housing member 10 of the guide assembly 1. The wire insertion block 20 has a mortar-shaped opening 21 and an insertion guide 22 that guides the wire electrode to the passage 2. The minimum inner diameter of the insertion guide 22 is formed larger than the outer diameter of the guide pipe 6 that guides the wire electrode. The guide pipe 6 is provided so as to be movable in a direction in which the wire electrode is stretched, more specifically, capable of moving up and down in the vertical direction (vertical direction). Therefore, the opening 21 and the insertion guide 22 of the wire insertion block 20 introduce the wire electrode and the guide pipe 6 into the guide assembly 1.

  As shown in FIGS. 1 to 4, the current-carrying body block 30 is provided in the housing member 10 positioned below the wire insertion block 20, and the current-carrying body 3 that feeds power to the wire electrode is stretched over the wire electrode. It is prepared to be movable in a direction orthogonal to the direction of the movement. The energization body 3 is held by the holding member 31. The current-carrying body block 30 has a hole 32 into which the pin 7 can be inserted between the current-carrying body block 30 and the guide unit 40. In the hole 32, a tip end portion 34 of a pin fixing member 33 that fits into a notch 71 (see FIG. 5 or FIG. 6) of the pin 7 protrudes. The passage 2 provided in the current-carrying body block 30 is formed in such a size that the wire electrode can pass and the guide pipe 6 that guides the wire electrode can pass through.

  An actuator 50 made of an air cylinder is integrally attached to the housing member 10. The piston rod 51 of the actuator 50 is connected to the energizing body block 30 that attaches and holds the energizing body 3. Due to the movement of the piston (not shown) of the actuator 50, the piston rod 51 moves and slides the current-carrying body block 30. As the current-carrying body block 30 slides, the current-carrying body 3 held by the holding member 31 moves forward and backward with respect to the passage 2, in other words, with respect to the wire electrode stretched in the vertical direction through the passage 2. The current-carrying body 3 can be taken out and replaced by a through-hole penetrating the side surface (the back side of the drawing).

  A flange 11 is formed in a lower portion of the housing member 10 facing the guide unit 40, and an attachment hole 12 having an inner shape that fits the outer shape of the guide unit 40 is formed by the flange 11. The guide unit 40 is fitted between the housing member 10 by fitting the guide unit 40 into the mounting hole 12 so that the inner shape of the mounting hole 12 and the outer shape of the guide unit 40 are fitted by the nozzle cap 8 of the coaxial jet nozzle 5. And attached to the housing member 10 so as to contain the guide unit 40. At this time, for example, the nozzle cap 8 is attached to the housing member 10 while engaging the female screw provided on the nozzle cap 8 and the male screw formed on the housing member 10 to rotate the entire nozzle cap 8. For example, it is attached by an appropriate method such as attaching to the housing member 10 with a screw penetrating the nozzle cap. When a member such as a block material or a unit is combined, a sealing material such as an O-ring is interposed as necessary. During electric discharge machining, the machining liquid jet is supplied from the opening 81 to the machining gap through the machining liquid flow path 82 of the coaxial jet nozzle 5 formed by the housing member 10, the guide unit 40, and the nozzle cap 8.

  As shown in FIG. 1, the guide unit 40 includes an upper part having an outer shape that fits with the inner shape of the mounting hole 12 and a lower part that holds the wire guide 4. More specifically, as shown in FIGS. 2 to 6, the upper part is constituted by the upper member 41, and the lower part is constituted by the lower member 42 and the intermediate member 43. The upper member 41 of the guide unit 40 has a groove 100 or a long hole 600 into which the pin 7 is inserted at a position facing the hole 32 provided in the current-carrying body block 30. The lower end portion 72 of the pin 7 is inserted in a state where the upper end portion having the notch 71 protrudes into the groove 100 or the long hole 600 provided in the guide unit 40 (see FIGS. 5 and 6), and the guide 7 is guided to the mounting hole 12. When the unit 40 is fitted, the notch 71 at the upper end portion is fitted and fixed to the tip end portion 34 of the pin fixing member 33 of the conductor block 30, and the groove 100 or the length provided in the conductor block 30 is fixed. The upper end portion is inserted into the hole 32 corresponding to the hole 600. Therefore, the pin 7 helps to position the guide unit 40 with respect to the mounting hole 12 and makes the replacement operation of the guide unit 40 easier.

  The guide unit 40 is fastened and fixed to the housing 10 from below with two bolts. The wire guide 4 is fixed to the guide unit 40 with screws. Therefore, when the wire guide 4 is worn and positioning accuracy cannot be obtained, the guide unit 40 can be replaced. Alternatively, the guide unit 40 is removed and the wire guide 4 is taken out and only the wire guide 4 is replaced. be able to. As shown in FIGS. 5 and 6, the outer shape of at least the upper portion of the guide unit 40, specifically, the outer shape of the upper member 41, is the type of the wire guide held by the guide unit 40 and the guide unit 40. Since it is common regardless of the difference in structure, even different wire guides can be easily and selectively attached.

  FIG. 2 shows a state where a guide unit 40A having a die guide 4A is attached to the guide assembly 1. FIG. 5 shows a guide unit 40A having a die guide 4A. Since the die guide 4A has no clearance or is small, high positioning accuracy can be obtained. In addition, since the guide body can be made of an ultra-hard wear-resistant member such as diamond, the life is relatively long, replacement work can be reduced, or running cost can be kept low. Further, the outlet side of the wire guide can be formed in a divergent shape suitable for large taper processing. Therefore, it is usually recommended to perform the wire cut electric discharge machining by attaching the guide unit 40A having the die guide 4A.

  As shown in FIG. 5, the guide unit 40 </ b> A has a sandwich structure in which the intermediate member 43 is sandwiched between an upper member 41 disposed on the upper side and a lower member 42 disposed on the lower side. The bolt hole A is for fastening the guide unit 40A to the housing 10 with bolts, and the tap hole B is for screwing the die guide 4A to the guide unit 40A (intermediate member and lower member). It is. In this embodiment, the outer shape of the upper member 41 of the guide unit 40A is substantially disk-shaped. On the other hand, the mounting hole 12 formed by the flange 11 of the housing member 10 is formed in a circular shape having a size that fits the outer shape of the guide unit 40A. In the embodiment, the outer shape of the guide unit 40A has a disk shape and a semicircular longitudinal groove C. Therefore, although the outer shape of the guide unit 40A and the inner shape of the mounting hole 12 of the housing member 10 do not exactly coincide with each other in a strict sense, the guide unit 40A is substantially aligned with the mounting hole 12 of the housing member 10. What is necessary is just to have the external shape inserted and accommodated. Note that the longitudinal groove C forms an introduction path for guiding the machining liquid to the machining liquid flow path 82 between the housing member 10 and the guide unit 40A when the guide unit 40A is fitted into the mounting hole 12 of the housing member 10. Since it is provided for the purpose, the vertical groove C is not required when a separate introduction path is provided.

  The upper member 41 has an outer shape that fits with the inner shape of the mounting hole 12 of the housing member 10. The upper member 41 includes a groove 100 that inserts the pin 7 and guides the guide unit 4A so that the guide unit 4A fits in the mounting hole 12, a funnel-shaped inlet portion 200 that guides the wire electrode and the guide pipe 6 to the die guide 4A, An inlet 300 for a machining fluid flow path for supplying a jet that restrains and guides the wire electrode during automatic connection is formed. The lower member 42 substantially constitutes a jet nozzle for automatic connection. The lower member 42 is formed with an ejection opening 400 for ejecting the jet. The intermediate member 43 is a member for holding the die guide 4 </ b> A, and has a guide attachment portion 500 that is fitted with the die guide 4 </ b> A and is held between the lower member 42.

  As shown in FIG. 2, since the die guide 4A has no clearance or is small, the guide pipe 6 for guiding the wire electrode cannot pass through the die guide 4A when performing automatic connection. Therefore, at the time of automatic connection, the guide pipe 6 is lowered so that its tip is positioned as close to the die guide 4A as possible. A flexible hose (not shown) for introducing the machining fluid is connected to the guide assembly 1. The machining fluid is introduced from the introduction port 300, a machining fluid jet for automatic connection is ejected from the ejection opening 400, and is sent out from the die guide 4 </ b> A. The wire electrode is guided while being restrained by the jet.

  In the guide assembly 1 according to the embodiment, the current-carrying body block 30 can move the current-carrying body 3 in a direction orthogonal to the direction in which the wire electrode is stretched, and the path 2 provided in the current-carrying body block 30 is a guide. Since it is larger than the outer diameter of the pipe 6, the wire electrode can be guided by the guide pipe 6 as far as the die guide 4 </ b> A by retreating the current-carrying body 3. The wire electrode exiting the die guide 4A is fed out from the opening 81 of the coaxial jet nozzle 5 toward the machining start hole or the lower wire guide while being restrained by the automatic connection jet. Therefore, the guide assembly 1 of the embodiment has an advantage that the probability of successful automatic connection is higher when the die guide 4A is equipped.

  3 and 4 show a state where a guide unit 40B having a split guide 4B is attached to the guide assembly 1. FIG. FIG. 6 shows a guide unit 40B having a split guide 4B. The split guide 4B is integrally formed on two guide pieces, that is, a guide piece 44 that can rotate about one horizontal axis and a guide piece 45 that can reciprocate in the horizontal one axis direction orthogonal to the horizontal one axis, and the upper surface of the guide piece 45. It is comprised from the pressing member 46 attached. Therefore, the split guide 4B can open the through hole by moving the guide pieces 44 and 45 as necessary, so that a passage for moving the guide pipe 6 can be formed, and it can be coaxially formed by a counterbore or a jig. The opening 81 of the jet nozzle 5 cannot be brought into close contact with the surface of the workpiece, and there is not much difference between the diameter of the case and the diameter of the wire starting electrode and the diameter of the wire starting hole that must be automatically connected in a so-called floating state. In such a case, it is recommended to perform wire-cut electric discharge machining by attaching a guide unit 40B having a split guide 4B that can lower the guide pipe 6 to the surface of the workpiece.

  As shown in FIG. 6, the guide unit 40B has a sandwich structure in which an intermediate member 43 is sandwiched between an upper member 41 disposed on the upper side and a lower member 42 disposed on the lower side. The bolt hole A is for fastening the guide unit 40B to the housing 10 with a bolt, and the tapped hole B is for screwing the split guide 4B to the guide unit 40B (intermediate member and lower member). It is. In this embodiment, the outer shape of the upper member 41 of the guide unit 40B is substantially disk-shaped. On the other hand, the mounting hole 12 formed by the flange 11 of the housing member 10 is formed into a circular shape having a size that fits the outer shape of the guide unit 40B. In the embodiment, the outer shape of the guide unit 40B has a disk shape and a semicircular longitudinal groove C. As already described, like the guide unit 40A, the outer shape of the guide unit 40B and the inner shape of the mounting hole 12 of the housing member 10 do not exactly match in a strict sense, but the guide unit 40B Need only have an outer shape that is fitted into and accommodated in the mounting hole 12 of the housing member 10. Specific structures of the upper member 41, the lower member 42, and the intermediate member 43 of the guide unit 40B are different from those of the unit 40A, but will be described using the same reference numerals.

  The upper member 41 of the guide unit 40 </ b> B has an outer shape that fits with the inner shape of the mounting hole 12 of the housing member 10. The upper member 41 has a long hole 600 that guides the pin 7 so as to be movable. From another point of view, the long hole 600 guides the guide unit 4 </ b> B so that the pin 7 is inserted into the mounting hole 12. The lower member 42 supports the split guide 4B from the lower side. Further, the intermediate member 43 is a member for holding the split guide 4B. Between the upper member 41 and the lower member 42, the guide piece 44 of the split guide 4B is arranged around one horizontal axis around the fulcrum O. The guide piece 45 is supported so as to be slidable in a horizontal axis direction orthogonal to the horizontal axis direction along a rail-shaped groove 700 formed in the intermediate member 43. The guide piece 45 and the pressing member 46 are provided with a through hole 800 into which the pin 7 is inserted.

  As shown in FIG. 3, when the guide unit 40 </ b> B is attached, the pin 7 is inserted into the hole 32 that opens to the lower side of the current-carrying body block 30, and the tip of the pin fixing member 33 is inserted into the notch 71 of the pin 7. The part 34 is fitted. A lower end portion 72 protruding from the current-carrying body block 30 on the lower end side of the pin 7 passes through the long hole 600 and is inserted into the guide piece 45 and the through hole 800 of the pressing member 46.

  As shown in FIG. 4, when the pipe guide 6 is passed through the split guide 4 </ b> B and lowered over the opening 81 of the coaxial jet nozzle 5 during automatic connection, the current-carrying body block 30 is slid by the actuator 50, When 3 is retracted from the travel path of the wire electrode, a path 2 through which the pipe guide 6 can pass is formed in the current-carrying body block 30. When the current-carrying body block 30 is moved in the direction in which the current-carrying body 3 moves backward, the pin 7 fitted in the hole 32 also moves together with the current-carrying body block 30. When the pin 7 moves, the guide piece 45 and the pressing member 46 through which the lower end portion 72 protruding from the energization block 30 of the pin 7 passes also retreats. When the pressing member 46 moves backward, the pressing member 46 comes out from above the guide piece 44 and the guide piece 44 is released, and the guide piece 44 rotates downward about the fulcrum O by its own weight. As a result, the through hole is opened and the guide pipe 6 can pass through the wire guide 4.

  On the other hand, when the current-carrying body block 30 slides in the direction in which the current-carrying body 3 is in contact with the wire electrode toward the travel path of the wire electrode, the pin 7 moves forward, and the guide piece 45 and the pressing member 46 move as the pin 7 moves forward. Also move forward. When the pressing member 46 moves forward, the tip end portion 900 of the pressing member 46 enters between the upper member 41 and the guide piece 44 so as to slide on the upper surface of the guide piece 44 in the open state. The guide piece 44 is rotated upward about the fulcrum O so as to press the rear upper surface of 44. As a result, as shown in FIG. 3, the split guide 4B is closed, and a through hole is formed.

  FIG. 7 shows another embodiment. 7A, the outer shape of the upper member 41 of the guide unit 4B shown in FIG. At this time, a recess portion (not shown) is formed so that the lower shape of the housing member 10 corresponds to the protruding portion D. In FIG. 7B, the outer shape of the upper member 41 of the guide unit 4B shown in FIG. At this time, the lower flange 11 of the housing member 10 has a protruding portion (not shown) corresponding to the notch groove E. The modified example as shown in FIG. 7 is advantageous in that the alignment by the pin 7 and the through hole 600 is easier, but compared with the outer shape of the guide unit 4 shown in FIG. 5 and FIG. However, it is not clear how much the work efficiency is improved, and it can be appropriately adopted in consideration of the manufacturing cost and the arrangement of members such as the machining fluid flow path.

  As described above, the upper wire guide assembly of the embodiment has an attachment hole having an inner shape that fits the outer shape of the guide unit on the lower surface side facing the guide unit of the main body housing member. Just by fitting the guide unit including the upper member having a common outer shape corresponding to the mounting hole, the guide unit for holding the wire guide can be accurately set, and the structure around the wire guide is made into the structure of the wire guide. It can be replaced with a suitable configuration. Therefore, regardless of the type of the wire guide, difficult alignment and installation work are not required, and an operator can easily replace the wire guide by the same installation method on the site, and thus change the automatic connection system.

  FIG. 8 shows a wire cut electric discharge machining apparatus provided with an upper guide assembly and an automatic connection device. The automatic connection device 9 includes a cutting device 91 that cuts the wire electrode, a guide pipe 6 that is provided so as to be movable in the direction in which the wire electrode is stretched, and a wire electrode that is cut by the cutting device 91 And a fluid supply member 92 for supplying a liquid jet flow that imparts straightness to the wire electrode into the guide pipe 6. The cutting device 91 is fused by the energizing roller 93 and the energizing roller 94.

  The automatic connection device 9 includes a clamp device 95, a collection box 96, and a tip detector 97. The clamp device 95 clamps and discharges the wire electrode cut pieces that are no longer needed after being cut by the cutting device 91. The collection box 96 collects the wire electrode cut pieces conveyed by the clamp device 93. The tip detector 97 detects the tip of the wire electrode when winding the wire electrode.

  The guide pipe 6 is moved up and down by an actuator (not shown). When the guide unit 40 </ b> A having the die guide 4 </ b> A is attached to the guide assembly 1, when the guide pipe 6 is lowered, the guide pipe 6 is inserted at least up to the wire insertion block 20 of the guide assembly 1. When the current-carrying unit 30 is movably provided so that the current-carrying body 3 can be moved back and forth, the guide pipe 6 can be lowered to the vicinity of the entrance of the die guide 4A beyond the current-carrying unit 30. . At this time, a jet such as a machining liquid is supplied into the guide pipe 6 from the liquid supply member 92, preventing the wire electrode from buckling in the guide pipe 6, and the wire exiting the guide pipe 6. The electrode is restrained by a jet protruding from the guide pipe 6 and is reliably guided. At the same time, the guide unit 4A has a configuration in which a jet for automatic connection can be introduced from the introduction port 300 and supplied from the ejection opening 400 through the machining liquid flow path, so that the wire electrode fed from the die guide 4A is It is restrained by the jet for automatic connection and inserted into the machining start hole. Therefore, a so-called jet type automatic connection method can be implemented.

  When the guide unit 40B having the split guide 4B is attached to the guide assembly 1, the guide pipe 6 exits the guide assembly 1 beyond the opening 81 of the coaxial jet nozzle 5 and descends to at least the surface of the workpiece. can do. At this time, a jet such as a machining liquid is supplied into the guide pipe 6 from the liquid supply member 92, preventing the wire electrode from buckling in the guide pipe 6, and the wire exiting the guide pipe 6. The electrode is restrained by a jet protruding from the guide pipe 6 and is reliably guided. Therefore, a so-called pipe jet type automatic connection method can be implemented.

  In the guide assembly according to the embodiment described above, the outer shape of at least the upper part of the guide unit 40, specifically, the outer shape of the upper member 41, is the type of the wire guide held by the guide unit 40 and the guide unit 40. It is common regardless of the difference in structure and basically matches the inner shape of the mounting hole 12. Therefore, the guide unit can be exchanged for a different type of wire guide by a simple operation of fitting the guide unit into the mounting hole 12 of the housing 10 and bolting and fixing the housing to the housing 10 and attaching the nozzle cap. Further, when the pin 7 is provided, the guide unit 40 can be easily positioned by the mounting hole 12 by the pin 7, and the wire guide 4 can be more easily positioned by the current-carrying body 3. As a matter of course, the present invention has an advantage that the wire guide can be easily replaced even when the same type of wire guide is replaced. The structure of the automatic wire connection device 9 is common regardless of the difference in the type of the wire guide and the structure of the guide unit 40. Therefore, one of the guide unit 40A in which the wire guide 4 is a die guide (round die guide) 4A and the guide unit 40B in which the wire guide is a split guide (split die guide) 4B can be selectively attached. By simply exchanging the guide unit, it is possible to implement and sell different automatic connection methods between the jet method and the pipe jet method.

  The wire-cut electric discharge machining apparatus having the guide assembly of the present invention and the automatic assembly apparatus provided with the guide assembly is not limited to the specifically described configuration, and some examples have already been given. The present invention can be modified without departing from the technical idea of the invention, combined with other inventions, or replaced with members.

  The present invention can be used for wire cut electric discharge machining. The present invention can be easily replaced with a plurality of different types of wire guides in the field, and as a result, a single wire-cut electric discharge machining apparatus can carry out different automatic guide connection methods. And, it expands the convenience of wire-cut electrical discharge machining equipment and contributes to the development of manufacturing technology for dies and precision parts.

It is sectional drawing which shows the left side surface of the state which removed the guide unit of the wire guide assembly of the wire cut electric discharge machining apparatus of this invention. It is sectional drawing which shows the left side surface of the state which attached the guide unit provided with the die guide of the wire guide assembly of the wire cut electrical discharge machining apparatus of this invention. It is sectional drawing which shows the left side surface of the state which attached the guide unit provided with the split guide of the wire guide assembly of the wire cut electrical discharge machining apparatus of this invention. FIG. 4 is a cross-sectional view showing the wire guide assembly shown in FIG. 3 with the split guide opened. It is a perspective view which shows the structure of the guide unit provided with the die guide in a cross section. It is a perspective view which shows the structure of the guide unit provided with the split guide in a cross section. It is a perspective view which shows embodiment of the upper member which has another external shape in the guide unit shown by FIG. It is a front view which shows an example of a guide assembly and an automatic connection apparatus.

Explanation of symbols

1 Wire Guide Assembly 2 Passage 3 Current Conductor 4 Wire Guide 4A Die Guide (Round Die Guide)
4B Split Guide (Cut Dice Guide)
5 Coaxial Jet Nozzle 6 Guide Pipe 7 Pin 8 Nozzle Cap 9 Automatic Termination Device 10 Housing Member 12 Mounting Hole 20 Wire Insertion Block 30 Current Conductor Block 40 Guide Unit 41 Upper Member 50 Actuator

Claims (6)

In a wire guide assembly in which a passage through which a wire electrode passes is provided and an electric conductor, a wire guide, and a coaxial jet nozzle are incorporated along the passage, a guide unit that holds the wire guide, and a surface that faces the guide unit A body housing member having a mounting hole having an inner shape that fits the outer shape of the guide unit, and the guide unit is fitted into the mounting hole so that the inner shape of the mounting hole fits the outer shape of the guide unit. And a nozzle cap of a coaxial jet nozzle attached to the housing member so as to enclose the guide unit between the housing member and the wire guide assembly. A lower end portion is inserted in a state where the upper end portion protrudes into a groove or a long hole provided in the guide unit, and the upper end portion is inserted into a hole provided in the current-carrying body block and corresponding to the groove or the long hole. The wire guide assembly of claim 1 comprising a pin. The guide unit constitutes an upper member having an outer shape that fits with the inner shape of the mounting hole, an intermediate member for holding a die guide or a split guide as a wire guide, and a jet nozzle for automatic connection or the split guide The wire guide assembly of Claim 1 comprised by the lower side member which supports from the lower side. 2. The wire guide assembly according to claim 1, further comprising: an energizer block that includes an energizer that feeds power to the wire electrode in the housing member so as to be movable in a direction orthogonal to a direction in which the wire electrode is stretched. . A wire-cut electric discharge machining apparatus having the wire guide assembly according to claim 1, wherein the cutting apparatus cuts the wire electrode, and is provided so as to be movable in a direction in which the wire electrode is stretched, to guide the wire electrode. An automatic connection device comprising: a guide pipe; and a fluid supply member that supplies a jet that constrains the wire electrode cut by the cutting device and imparts straightness to the wire electrode into the guide pipe. Wire-cut electric discharge machine. 6. The wire according to claim 5, wherein one of the guide unit in which the wire guide is a die guide and the guide unit in which the wire guide is a split guide can be selectively attached to the wire guide assembly. Cut electrical discharge machining equipment.

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