JP6143351B2 - Wire electric discharge machine - Google Patents

Description

The present invention relates to a wire electric discharge machine capable of attaching a wire electrode component to an arbitrary region of a core and preventing a workpiece from falling.

Wire electric discharge machining, in which electric discharge machining performed by generating an electric discharge between electrodes formed between a machining electrode and a workpiece, is applied to a saw blade-like cutting process using a wire electrode for a plate-like workpiece, has been widely known and has become widespread. ing. In this wire electric discharge machining, a technology that adheres wire electrode components to any area of the core is used to prevent the core that forms the inner part of the work cut off by the machining groove during machining. Such a technique is disclosed in Patent Document 1 and Patent Document 2, for example.

Japanese Examined Patent Publication No. 61-041690 JP-A-62-218024

  By the way, the adhesion of the wire electrode components as described above has been conventionally performed only on one side of the upper side or the lower side of the core. However, if the components are attached only on one side of the core, sufficient adhesion cannot be obtained, and the core may fall during processing, which may hinder processing.

The present invention has been made in view of the above problems, and an object of the present invention is to provide a wire electric discharge machine capable of reliably holding a core on a workpiece during machining.

In order to achieve the above object, a wire electric discharge machine according to claim 1 is characterized in that a wire electrode for processing a work placed on a work table is provided with an upper wire guide and a lower wire electrode disposed above the work. While being guided by the lower wire guide arranged on the side, it is drawn out from the upper side and moved along the machining path to form a machining groove on the workpiece, and the core forming the inner part of the workpiece separated by the machining groove A wire electric discharge machine having a configuration in which a component of a wire electrode is attached to an arbitrary region to prevent the workpiece from falling, and the workpiece has a negative potential between the poles formed between the workpiece and the wire electrode. Whether the wire electrode is set vertically, with the reverse polarity voltage applied to the wire electrode being positive and the horizontal position of the upper and lower wire guides being the same. The lower wire guide is moved forward relative to the upper wire guide along the machining path, the electric discharge machining is performed by inclining the wire electrode, and then the lower wire guide is stopped to move upward along the machining path. The wire electrode component was attached to both the upper and lower sides of the core by advancing the wire guide relative to the lower wire guide and performing electric discharge machining until the wire electrode returned to vertical. after, it characterized Rukoto to reverse the polarity so that the workpiece in the machining gap the wire electrode becomes a positive potential is applied to positive voltage as the negative potential.

In the present invention , a reverse polarity voltage is applied between the electrode formed between the workpiece and the wire electrode so that the workpiece has a negative potential and the wire electrode has a positive potential, and the horizontal direction of the upper wire guide and the lower wire guide is From the state where the wire electrode is set vertically with the same position, the lower wire guide is advanced relative to the upper wire guide along the machining path, and the wire electrode is inclined to perform electric discharge machining. By stopping the side wire guide and moving the upper wire guide relative to the lower wire guide along the machining path and performing electric discharge machining until the wire electrode returns to the vertical, the upper side and lower side of the core After the wire electrode component is attached to either side, the polarity is reversed so that a positive voltage is applied between the electrodes so that the workpiece has a positive potential and the wire electrode has a negative potential. Thereby, a core can be reliably hold | maintained to a workpiece | work during a process.

According to the present invention, the core can be reliably held on the workpiece during machining.

It is a schematic diagram which shows the outline | summary of the whole structure in the wire electric discharge machine which concerns on 1st Embodiment of this invention. It is a circuit diagram which shows the structure of the power supply device in the wire electric discharge machine. It is a circuit diagram which shows the structure of the power supply device at the time of processing a non-adhesion area | region (when a positive voltage is applied between poles). It is a circuit diagram which shows the structure of the power supply device at the time of processing an adhesion area | region (when a reverse polarity voltage is applied between poles). It is a top view for demonstrating the adhesion method of the brass component of the wire electrode with respect to the core in this invention. It is a top view which expands and shows a part of FIG. 5 for demonstrating the adhesion method of the brass component of the wire electrode with respect to a core. It is a front view which expands and shows a part of FIG. 5 for demonstrating the adhesion method of the brass component of the wire electrode with respect to a core. It is another side view which expands and shows a part of FIG. 5 for demonstrating the adhesion method of the brass component of the wire electrode with respect to a core. It is a block diagram which shows the structure of NC control apparatus in a wire electric discharge machine. It is a flowchart for demonstrating the adhesion method of the brass component by NC control apparatus .

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 is a diagram showing an outline of the entire configuration of a wire electric discharge machine 1 showing a first embodiment of the present invention. The outline of the wire electric discharge machine 1 will be described with reference to FIG. 1. The wire electric discharge machine 1 continuously connects a wire electrode E made of brass as a tool electrode between an upper wire guide 2 and a lower wire guide 3. While being supplied, the workpiece W is subjected to electric discharge machining in a state where the workpiece W is immersed in an aqueous machining fluid (hereinafter, the aqueous machining fluid is simply referred to as machining fluid). The wire electric discharge machine 1 is performed by placing the workpiece W on the workpiece table 5 and applying a predetermined voltage to the gap 7 between the wire electrode E and the workpiece W by the power supply device 10.

  As shown in FIG. 2, the power supply device 10 includes a processing DC power supply 11 and a switching circuit 12. In the switching circuit 12, four switching transistors 12A to 12D are bridge-connected as shown in the figure, and a connection point J between the switching transistor 12B and the switching transistor 12D is connected to the negative side of the processing DC power source 11, and the switching transistor 12A The connection point K with the switching transistor 12C is connected to the plus side of the processing DC power supply 11. A connection point L between the switching transistor 12A and the switching transistor 12B is electrically connected to the wire electrode E through the energization elements 2a and 3a, and a connection point M between the switching transistor 12C and the switching transistor 12D is electrically connected to the work W. Connected.

As shown in FIG. 3, when the switching transistors 12B and 12C are turned on and the switching transistors 12A and 12D are turned off, the plus side of the machining DC power supply 11 and the workpiece W are electrically connected, and machining is performed. The negative side of the direct current power source 11 is electrically connected to the wire electrode E, and a positive rectangular wave pulse voltage in which the workpiece W is at a positive potential and the wire electrode E is at a negative potential is applied to the gap 7 during machining. The

As shown in FIG. 4, when the switching transistors 12A and 12D are turned on and the switching transistors 12B and 12C are turned off, the negative side of the machining DC power supply 11 and the workpiece W are electrically connected, and machining is performed. The positive side of the DC power supply 11 and the wire electrode E are electrically connected, and a reverse polarity rectangular wave pulse voltage in which the workpiece W is a negative potential and the wire electrode E is a positive potential is applied to the gap 7 during machining. .

By switching on and off the switching transistors 12A and 12D and the switching transistors 12B and 12C alternately, a high-frequency bipolar rectangular-wave pulse voltage that alternately repeats the output of a rectangular-wave pulse voltage having both positive and reverse polarities at a high frequency It can be applied to the gap 7. Furthermore, the wire electric discharge machine 1 is performed while setting the distance between the poles 7 to a predetermined value by each axis motor 6 that forms the drive mechanism of each moving axis.

In the present invention, the U axis, V axis, X axis, Y axis, and Z axis are set as the movement axes. The U axis is the horizontal movement axis of the upper wire guide 2, the V axis is the movement axis orthogonal to the U axis along the horizontal direction, and the X axis is the horizontal movement axis of the lower wire guide 3. , The Y axis is a movement axis orthogonal to the X axis along the horizontal direction, and the Z axis is a movement axis in the vertical axis direction. The wire electric discharge machine 1 is set so that the moving direction of the upper wire guide 2 along the U axis and the V axis is opposite to the moving direction of the lower wire guide 3 along the X axis and the Y axis. Then, the wire electrode E can be inclined and the workpiece W can be tapered.

The wire electric discharge machine 1 further includes an NC control device 20, and the NC control device 20 generates a predetermined control signal while decoding the machining program. That is, the wire electric discharge machine 1 operates each shaft motor 6 and the power supply device 10 on the basis of the control signal generated by the NC control device 20, and attaches the brass component of the wire electrode E to an arbitrary portion of the core. Electric discharge machining can be performed.

A method of attaching the brass component to the core by the wire electric discharge machine 1 will be described as follows. That is, as shown in FIG. 5, first, the machining path B is set in the workpiece W, the adhesion region C of the brass component of the wire electrode E is set on the machining path B, and the other machining path B is set as the non-adhesion area D. Meanwhile, each wire motor 6 is operated to move the wire electrode E along the machining path B while forming the machining groove F.

That is, as shown in FIGS. 6 and 7, in the non-attachment region D, the upper wire guide 2 and the lower wire guide 3 are set at the same horizontal position, and the wire electrode E is set vertically. In the non-attachment region D, the switching circuit 12 is in the state shown in FIG.

On the other hand, in the adhesion region C, as shown in FIG. 6, the switching circuit 12 is in the state shown in FIG. Then, in the adhesion region C, as shown in FIG. 8A, the upper wire guide 2 and the lower wire guide 3 are set at the same horizontal position, and the wire electrode E is set vertically. ), Only the lower wire guide 3 is advanced along the traveling direction of the machining path B (hereinafter, “along the traveling direction of the machining path B” is simply referred to as “along the machining path B”). As a result, the lower wire guide 3 is advanced along the processing path B before the upper wire guide 2, and the inclination of the wire electrode E is applied along the processing path B, and the lower side of the core A At the same time as the formation of the processed groove F, the brass component of the wire electrode E is adhered. Then, as shown in FIG. 8C, the upper wire guide 2 is advanced while the lower wire guide 3 is stopped, and the horizontal positions of the upper wire guide 2 and the lower wire guide 3 are made the same. While the wire electrode E is set vertically, the brass component of the wire electrode E is attached simultaneously with the formation of the processing groove F on the upper side of the core A until the end of the attachment region C is reached after a certain time interval. The operations of FIG. 8B and FIG. 8C are repeated. Thereby, the brass component of the wire electrode E can be adhered to both the upper side and the lower side of the core A.

In the present invention, the NC control device 20 is provided so that the adhesion control of the brass component of the core A can be performed. As shown in FIG. 9, the NC control device 20 comprises an input means 30, a storage means 40, and a processing means 50, and these means 30 to 50 function to generate a control signal. The brass component of the wire electrode E can be attached to both the upper side and the lower side of the child A.

The input unit 30 includes, for example, a keyboard, a mouse, a touch panel, or the like, and information necessary for various processes in the processing unit 50 is input from the input unit 30. Information for reading out the machining program stored in the storage unit 40 is input from the input unit 30. The input unit 30 includes a configuration for inputting various information from other devices via USB and LAN.

The storage means 40 stores a machining program for executing wire electric discharge machining. The machining program applies a positive voltage to the gap 7 and applies a reverse polarity voltage to the first machining condition B, the gap 7 for normal wire electric discharge machining, and adhesion of the brass component Data relating to each of the adhesion processing conditions forming the second processing conditions for performing the adhesion and the adhesion region C are included. A region other than the adhesion region C in the processing path B is a non-adhesion region D.

Based on the various information input from the input unit 30 and the machining program stored in the storage unit 40, the processing unit 50 sets the setting unit 51 and the adhesion region machining to perform wire electric discharge machining while attaching the brass component. It functions as the control means 52, the non-attached area processing control means 53, and the area determination means 54.

  The setting unit 51 reads the machining program from the storage unit 40 based on the information input from the input unit 30, and processes the machining path B, the first machining condition, the second machining condition, the adhesion region C, and the non-adhesion region. A function for setting D is provided.

The adhesion region machining control means 52 generates a predetermined control signal to operate each shaft motor 6 and the power supply device 10, and in the adhesion region C set by the setting means 51, under the second machining condition, FIG. As shown, the lower wire guide 3 is advanced along the machining path B before the upper wire guide 2, and the inclination of the wire electrode E is applied along the machining path B, and only the lower side of the core A is shown. Simultaneously with the formation of the processing groove F, the brass component of the wire electrode E is adhered. Similarly, as shown in FIG. 8, the upper wire guide 2 is advanced while the lower wire guide 3 is stopped, and the brass of the wire electrode E is formed simultaneously with the formation of the machining groove F on the upper side of the core A. The function of attaching the components and then repeating these operations until reaching the end of the attachment region C at regular time intervals to attach the brass component of the wire electrode E to both the upper side and the lower side of the core A have.

  The non-adhesion area machining control means 53 generates a predetermined control signal to operate each motor 6 and the power supply device 10, and the wire electrode along the machining path B in the non-adhesion area D set by the setting means 51. It has a function of performing normal electric discharge machining of the workpiece W based on the first machining condition while moving E, that is, forming only the machining groove F without attaching the brass component of the wire electrode E.

The area determination means 54 detects the position of the wire electrode E on the machining path B as necessary during execution of the wire electric discharge machining, and determines whether the position of the wire electrode E is in the attached area C or the non-attached area D. It has a function to perform.

Next, a method of attaching the brass component of the wire electrode E by the NC control device 20 will be described in detail based on the flowchart of FIG.
First, in step S10, the setting means 51 reads the machining program from the storage means 40 based on the predetermined information input from the operator via the input means 30, and the first machining condition, machining path B, second The machining conditions, the adhesion region C, and the non-adhesion region D are set, and the execution of wire electric discharge machining of the workpiece W is started.

Next, in step S20, the region determination means 54 detects the position of the wire electrode E on the processing path B as necessary, determines whether the position of the wire electrode E is on the adhesion region C, and the adhesion region C. If determined to be above, in step S30, the adhesion region machining control means 52 generates a control signal to operate each shaft motor 6 and the power supply device 10, and in the adhesion region C, under the second machining condition. The lower wire guide 3 is advanced along the machining path B before the upper wire guide 2, and the inclination of the wire electrode E is applied along the machining path B so that the machining groove F is formed only on the lower side of the core A. At the same time as forming, the brass component of the wire electrode E is adhered. Then, the upper wire guide 2 is advanced while the lower wire guide 3 is stopped, and the brass component of the wire electrode E is attached simultaneously with the formation of the processing groove F on the upper side of the core A. These operations are repeated until the end of the adhesion region C is reached at a time interval of. As a result, the brass component of the wire electrode E is attached to both the upper side and the lower side of the core A.

On the other hand, in step S20, when the region determining means 54 determines that the position of the wire electrode E on the processing path B is not on the attached region C, that is, when the position of the wire electrode E is determined to be on the non-attached region D. In step S40, the non-attachment area machining control means 53 generates a control signal to operate each axis motor 6 and the power supply device 10, and moves the wire electrode E along the machining path B in the non-attachment area D. On the other hand, normal electric discharge machining of the workpiece W is executed based on the first machining condition, and thereafter, in step S50, the operations in steps S30 to S40 are performed until the NC controller 20 confirms the end of the wire electric discharge machining.

In addition, this invention is not limited to embodiment mentioned above, Of course, various application implementation or deformation | transformation implementation is possible as needed. That is, for example, in the embodiment described above, the machining fluid is an aqueous machining fluid, but the brass adhesion method of the present invention can also be implemented as an oil-based machining fluid.

In the embodiment described above, the wire electrode E is inclined by moving the upper wire guide 2 and the lower wire guide 3 in the horizontal direction along the U axis, the V axis, the X axis, and the Y axis, respectively. The brass component of the wire electrode E is attached to both the upper side and the lower side of the core A, but the work table 5 is moved in the horizontal direction along the X axis and the Y axis. It is good also as attaching a brass component.

That is, for example, when the inclination of the wire electrode E is given along the processing path B, the wire electrode E is set vertically with the upper wire guide 2 and the lower wire guide 3 set at the same horizontal position. 13 (a), the lower wire guide 3 is moved along the machining path B before the upper wire guide 2 by advancing only the lower wire guide 3 along the machining path B. The workpiece W and the wire electrode E are advanced to a position just before the contact, and the inclination of the wire electrode E is given along the machining path B. Subsequently, as shown in FIG. After the work table 5 is moved in the horizontal direction so as to be in contact with the electrode E, the brass component of the wire electrode E is attached simultaneously with the formation of the machining groove F only on the lower side of the core A, and then, as shown in FIG. As shown While the lower wire guide 3 is in a stopped state, the upper wire guide 2 is advanced, and the brass component of the wire electrode E is attached simultaneously with the formation of the processing groove F on the upper side of the core A, and this is repeated. Thus, the brass component of the wire electrode E can be attached to both the upper side and the lower side of the core A.

The wire electric discharge machine of the present invention can prevent the core from dropping during machining, and contributes to a dramatic improvement in machining efficiency.

A: Core B: Processing path C: Adhering region D: Non-adhering region E: Wire electrode F: Processing groove H: Center position in the thickness direction of the workpiece I: Intersections J, K, L, M: Connection point 1: Wire Electric discharge machine 2: upper wire guide 2a: energizing element 3: lower wire guide 3a: energizing element 4: machining tank 5: work stand 6: motor for each axis 7: distance 10: power supply 11: DC power supply 12 for machining : Switching circuits 12A to 12D: switching transistor 20: NC control device 30: input means 40: storage means 50: processing means 51: setting means 52: adhesion area machining control means 53: non-attachment area machining control means 54: area judgment means

Claims (1)

The wire electrode for processing the workpiece placed on the work table is drawn out from above while being guided by the upper wire guide arranged on the upper side and the lower wire guide arranged on the lower side through the workpiece. The workpiece is moved along a path to form a machining groove in the workpiece, and the wire electrode component is attached to an arbitrary region of the core forming the inner part of the workpiece separated by the machining groove, so that the workpiece falls. A wire electric discharge machine with a structure for preventing
A reverse polarity voltage is applied across the pole formed between the workpiece and the wire electrode so that the workpiece has a negative potential and the wire electrode has a positive potential, and the upper wire guide and the lower wire guide are horizontal. From a state in which the position of the direction is the same and the wire electrode is set vertically, the lower wire guide is moved forward relative to the upper wire guide along the machining path, and the wire electrode is inclined to discharge. After machining, the lower wire guide is stopped, the upper wire guide is advanced relative to the lower wire guide along the machining path, and electric discharge machining is performed until the wire electrode returns to the vertical direction. After the wire electrode components are attached to both the upper side and the lower side of the core, the workpiece becomes positive potential between the poles. Wire electric discharge machine according to claim Rukoto to reverse the polarity so as to apply a positive voltage to the electrode has a negative potential.

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