WO2006080777A1 - Cnc small hole electric discharge machine - Google Patents

Cnc small hole electric discharge machine Download PDF

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Publication number
WO2006080777A1
WO2006080777A1 PCT/KR2005/004638 KR2005004638W WO2006080777A1 WO 2006080777 A1 WO2006080777 A1 WO 2006080777A1 KR 2005004638 W KR2005004638 W KR 2005004638W WO 2006080777 A1 WO2006080777 A1 WO 2006080777A1
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WIPO (PCT)
Prior art keywords
machining
data
electric discharge
shape
workpiece
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Application number
PCT/KR2005/004638
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French (fr)
Inventor
Chang Young Lim
Original Assignee
Chang Young Lim
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Publication of WO2006080777A1 publication Critical patent/WO2006080777A1/en

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H13/00—Switches having rectilinearly-movable operating part or parts adapted for pushing or pulling in one direction only, e.g. push-button switch
    • H01H13/50—Switches having rectilinearly-movable operating part or parts adapted for pushing or pulling in one direction only, e.g. push-button switch having a single operating member
    • H01H13/56—Switches having rectilinearly-movable operating part or parts adapted for pushing or pulling in one direction only, e.g. push-button switch having a single operating member the contact returning to its original state upon the next application of operating force
    • G—PHYSICS
    • G05—CONTROLLING; REGULATING
    • G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
    • G05B19/00—Programme-control systems
    • G05B19/02—Programme-control systems electric
    • G05B19/18—Numerical control [NC], i.e. automatically operating machines, in particular machine tools, e.g. in a manufacturing environment, so as to execute positioning, movement or co-ordinated operations by means of programme data in numerical form
    • G05B19/4097—Numerical control [NC], i.e. automatically operating machines, in particular machine tools, e.g. in a manufacturing environment, so as to execute positioning, movement or co-ordinated operations by means of programme data in numerical form characterised by using design data to control NC machines, e.g. CAD/CAM
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H13/00—Switches having rectilinearly-movable operating part or parts adapted for pushing or pulling in one direction only, e.g. push-button switch
    • H01H13/02—Details
    • H01H13/023—Light-emitting indicators
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H13/00—Switches having rectilinearly-movable operating part or parts adapted for pushing or pulling in one direction only, e.g. push-button switch
    • H01H13/02—Details
    • H01H13/12—Movable parts; Contacts mounted thereon
    • H01H13/14—Operating parts, e.g. push-button
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H13/00—Switches having rectilinearly-movable operating part or parts adapted for pushing or pulling in one direction only, e.g. push-button switch
    • H01H13/02—Details
    • H01H13/26—Snap-action arrangements depending upon deformation of elastic members
    • H01H13/28—Snap-action arrangements depending upon deformation of elastic members using compression or extension of coil springs
    • G—PHYSICS
    • G05—CONTROLLING; REGULATING
    • G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
    • G05B2219/00—Program-control systems
    • G05B2219/30—Nc systems
    • G05B2219/45—Nc applications
    • G05B2219/45221—Edm, electrical discharge machining, electroerosion, ecm, chemical
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H2219/00—Legends
    • H01H2219/002—Legends replaceable; adaptable
    • H01H2219/014—LED
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H2231/00—Applications
    • H01H2231/026—Car
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P90/00—Enabling technologies with a potential contribution to greenhouse gas [GHG] emissions mitigation
    • Y02P90/02—Total factory control, e.g. smart factories, flexible manufacturing systems [FMS] or integrated manufacturing systems [IMS]

Definitions

  • the present invention relates to a computer numerical control small hole electric discharge machine and, more particularly, to a computer numerical control small hole electric discharge machine capable of monitoring overall machining states using input computer-aided design data, which can perform machining using only the input computer-aided design data, and which clearly displays the shape and machined state of a workpiece, thus remarkably reducing the defect rate of products.
  • Background Art
  • the term "electric discharge machining” refers to a method of performing machining in such a manner as to use a metal piece (a workpiece) as a positive electrode (+), and a tool electrode as a negative electrode (-), put them into a liquid having an insulating characteristic, and repeatedly generate a pulse discharge by applying current to the electrodes, thus eroding the surface of the workpiece by electronic bombardment at high temperature.
  • Electric discharge machines are classified into a wire cutting electric discharge machine and a forming electric discharge machine.
  • the forming electric discharge machine is a machine using a formed electrode, is chiefly used to manufacture metal molds, and basically includes a main body, a power unit, a machining liquid supply unit, a servo mechanism, and a machining mechanism.
  • the Computer Numerical Control (CNC) electric discharge machine which is a machine that automatically performs a series of machining operations using a computer, includes a data input unit for inputting machining criteria, a data storage unit for storing machining criteria classified into Numerical Control (NC) machining data, an operation control unit for activating machining criteria data, and a display unit for displaying machined states.
  • NC Computer Numerical Control
  • the machining criteria which are input through the data input unit, include machining voltage, a electrode type, a pulse width, a machining process, the shape of a workpiece, a machining point, the movement path of an electrode, and other special specifications.
  • Such machining criteria are appropriately set according to the size or material of the workpiece, the intended use of the workpiece, etc.
  • Machining using the CNC electric discharge machine is advantageous in that a desired shape can be formed with a relatively good precision without limitations with respect to hardness and viscosity as long as the workpiece has conductivity, and machining can be performed without application of mechanical force to the electrode or to the workpiece.
  • the conventional CNC electric discharge machine is inconvenient in that, after a drawing has been prepared on a Computer- Aided Design (CAD) system, the shape of a workpiece, a machining point, and the movement path of an electrode must be input using an NC machining programming device, converted into detailed NC machining data, and then used in the CNC electric discharge machine.
  • CAD Computer- Aided Design
  • an object of the present invention is to provide a CNC small hole electric discharge machine capable of monitoring overall machining states using input CAD data, which can perform machining using only the CAD data input to the CNC small hole electric discharge machine, and which can display the overall machined state of a workpiece on a display unit.
  • the present invention provides a CNC small hole electric discharge machine capable of monitoring overall machining states using input CAD data
  • the CNC small hole electric discharge machine including a data input unit for inputting machining criteria, such as an electrode type, a machining voltage, the shape of a workpiece, a machining point and the movement path of an electrode, a data storage unit for storing NC machining data into which machining criteria are systematically classified, an operation control unit for activating the machining criteria from the data storage unit, an electric discharge machining unit for performing machining according to the machining criteria, and a display unit for displaying the machining criteria and machining states, wherein:
  • the data storage unit comprises a data conversion unit for converting the CAD data, such as the shape of the workpiece, which is input through the data input unit, into the NC machining data; and [13] the display unit displays the shape of the workpiece, the machining point, and the movement path of the electrode.
  • the data conversion unit includes a Computer- Aided Manufacturing (CAM) system for analyzing the input CAD data, extracting a machining sequence or a machining path with reference to the machining criteria stored in the data storage unit, and generating NC machining data.
  • the shape of the workpiece displayed on the display unit includes a shape before machining, a shape during machining, and a shape after machining. The shape before machining, the shape during machining, and the shape after machining of the workpiece displayed on the display unit are indicated in different colors.
  • the above-described CNC small hole electric discharge machine capable of monitoring the overall machining states using input CAD data, facilitates the data input by using the CAD data and allows the overall machining process to be monitored, so that the location of a workpiece can be reliably set, and the defect rate of completed products can be remarkably reduced.
  • FlG. 1 is a perspective view showing a CNC small hole electric discharge machine capable of monitoring the overall machining states using input CAD data according to the present invention
  • FlG. 2 is a block diagram showing the construction of the CNC small hole electric discharge machine according to the present invention
  • FlG. 3 is a flowchart illustrating a machining process using the CNC small hole electric discharge machine according to the present invention
  • FlG. 4 is a diagram showing display screens for respective machining steps of the
  • [25] 4 input unit (keyboard and mouse)
  • FlG. 1 is a perspective view showing a CNC small hole electric discharge machine capable of monitoring the overall machining states using input CAD data according to the present invention
  • FlG. 2 is a block diagram showing the construction of the CNC small hole electric discharge machine according to the present invention
  • FlG. 3 is a flowchart illustrating a machining process using the CNC small hole electric discharge machine according to the present invention
  • FlG. 4 is a diagram showing display screens for respective machining steps of the CNC small hole electric discharge machine according to the present invention.
  • the CNC small hole electric discharge machine capable of monitoring the overall machining states using input CAD data according to the present invention basically includes an X, Y, Z-axis slide rest 1, a tool electrode (drill member) 2, a power unit (not shown), a work table 3, an input unit (keyboard and mouse) 4, and a display unit (monitor) 5, like a general CNC electric discharge machine.
  • reference characters J and W are respectively a jig and a workpiece, which is a target to be machined.
  • the CNC small hole electric discharge machine of the present invention includes a data input unit 10, a data storage unit 20, an operation control unit 30, an electric discharge machining unit 40, and a display unit 50.
  • the data input unit 10 selectively inputs machining voltage, an electrode (drill member) type, an ON-time pulse width, an OFF-time pulse width, a machining process, a jump value, the shape of the workpiece, a machining point, the movement path of an electrode, and other special specifications according to the type or intended use of the workpiece W.
  • the shape of the workpiece, the machining point, and the movement path of the electrode are input in the form of drawing data (CAD data) that was already designed using a CAD system.
  • CAD data drawing data
  • the machining voltage, the electrode (drill member) type, pulse widths, a machining process, a jump value, and other special specifications, which are machining criteria set through the data input unit 10, are systematically classified and are then stored in the data storage unit 20.
  • the data storage unit 20 includes a data conversion unit 21 for converting the CAD data, such as the shape of the workpiece, that is input through the data input unit 10, into NC machining data.
  • the data conversion unit 21 includes a CAM system for analyzing the input CAD data, extracting a machining sequence or a machining path with reference to the machining criteria stored in the data storage unit 20, and generating NC machining data.
  • the operation control unit 30 subsequently activates the machining criteria, the shapes of the workpiece, and NC machining data, which have been classified and then stored in the data storage unit 20, and controls the electric discharge machining unit 40 and the display unit 50 to perform machining and display.
  • the electric discharge machining unit 40 applies Direct Current (DC) power to the tool electrode (drill member) and the workpiece W according to the machining criteria stored in the data storage unit 20 under the control of the operation control unit 30, thus performing actual machining.
  • DC Direct Current
  • the display unit 50 basically displays a selection menu with which the machining criteria can be input through the data input unit 10, and displays the overall details with respect to electric discharge machining, such as machining criteria, a machining path obtained when machining is actually performed, and machining states under the control of the operation control unit 30.
  • the display unit 50 accumulatively displays the shape before machining of the workpiece, the point at which actual machining will be performed, the movement path of the electrode (drill member), the shape during machining of the workpiece, and the shape after machining of the workpiece, so that the overall machining process and overall machining states can be monitored at a glance.
  • the display unit 50 may display only the shape of the workpiece, the machining point, or the movement path of the electrode (drill member) that is obtained at a specific machining step with reference to data about the accumulated overall machining process.
  • a user simply and personally inputs the CAD data into the data input unit 10 after preparing a drawing using the CAD system, without performing the task of conversion into detailed NC machining data by inputting the shape of the workpiece, the machining point, and the movement path of the electrode using an NC machining programming device.
  • the CAM system which is provided in the data conversion unit 21 of the data storage unit 20, analyzes the input CAD data, such as the shape of the workpiece, extracts a machining sequence or a machining path etc., with reference to several machining criteria that have already been stored in the data storage unit 20, and generates the NC machining data at step 200.
  • the display unit 50 displays the shape before machining of the workpiece (including an already machined point Pl) under the control of the operation control unit 30 at step S300 (FlG. 4a).
  • the point P2 to be actually machined (the point not yet machined) and the movement path L of the electrode (the path not yet moved) are indicated by a dotted line or in different colors, so that they are differentiated from the shape of the workpiece or the already machined point Pl.
  • the electric discharge machining unit 40 moves the tool electrode (drill member) according to the movement path L of the electrode, which is displayed on the display unit 50, to the actual machining point P2 and then performs electric discharge machining at step 500 (FlG. 4c).
  • the display unit 50 indicates point P2 to be actually machined using a color different from that of the workpiece or flashes the actual machining point P2 while the electric discharge machining is being performed, thus allowing whether the machining is performed to be clearly recognized at step S600.
  • the display unit 50 displays the shape before machining of the workpiece and the shape after machining of the workpiece together at step S700.
  • the shapes before and after machining of the workpiece displayed on the display unit 50 be indicated in different colors to be differentiated from each other.
  • the display unit 50 displays the shape before machining of the workpiece and the shape after machining of the workpiece together with the shape during machining of the workpiece, so that the machined states for respective steps can be visually monitored with ease, therefore the defect rate of products can be reduced.

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  • Engineering & Computer Science (AREA)
  • Human Computer Interaction (AREA)
  • Manufacturing & Machinery (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Automation & Control Theory (AREA)
  • Electrical Discharge Machining, Electrochemical Machining, And Combined Machining (AREA)
  • Numerical Control (AREA)

Abstract

The present invention relates to a Computer Numerical Control (CNC) small hole electric discharge machine and, more particularly, to a computer numerical control small hole electric discharge machine capable of monitoring overall machining states using input computer-aided design data, which has a data storage unit provided with a data conversion unit for converting Computer- Aided Design (CAD) data into Numerical Control (NC) machining data, and allows the shape of a workpiece and the overall machining states to be displayed on a display unit, thus facilitating the input of data, reliably setting the location of the workpiece, and remarkably reducing the defect rate of products.

Description

Description
CNC SMALL HOLE ELECTRIC DISCHARGE MACHINE
Technical Field
[1] The present invention relates to a computer numerical control small hole electric discharge machine and, more particularly, to a computer numerical control small hole electric discharge machine capable of monitoring overall machining states using input computer-aided design data, which can perform machining using only the input computer-aided design data, and which clearly displays the shape and machined state of a workpiece, thus remarkably reducing the defect rate of products. Background Art
[2] Generally, the term "electric discharge machining" refers to a method of performing machining in such a manner as to use a metal piece (a workpiece) as a positive electrode (+), and a tool electrode as a negative electrode (-), put them into a liquid having an insulating characteristic, and repeatedly generate a pulse discharge by applying current to the electrodes, thus eroding the surface of the workpiece by electronic bombardment at high temperature.
[3] Electric discharge machines are classified into a wire cutting electric discharge machine and a forming electric discharge machine. Of the electric discharge machines, the forming electric discharge machine is a machine using a formed electrode, is chiefly used to manufacture metal molds, and basically includes a main body, a power unit, a machining liquid supply unit, a servo mechanism, and a machining mechanism.
[4] Meanwhile, the Computer Numerical Control (CNC) electric discharge machine, which is a machine that automatically performs a series of machining operations using a computer, includes a data input unit for inputting machining criteria, a data storage unit for storing machining criteria classified into Numerical Control (NC) machining data, an operation control unit for activating machining criteria data, and a display unit for displaying machined states.
[5] In particular, the machining criteria, which are input through the data input unit, include machining voltage, a electrode type, a pulse width, a machining process, the shape of a workpiece, a machining point, the movement path of an electrode, and other special specifications. Such machining criteria are appropriately set according to the size or material of the workpiece, the intended use of the workpiece, etc.
[6] Machining using the CNC electric discharge machine is advantageous in that a desired shape can be formed with a relatively good precision without limitations with respect to hardness and viscosity as long as the workpiece has conductivity, and machining can be performed without application of mechanical force to the electrode or to the workpiece.
[7] Furthermore, unmanned operation is possible, a machined surface is uniform, and almost all types of machining is possible, so that a small hole, a groove, a tapped hole, and a curve can be formed, therefore the machining using the CNC electric discharge machine is known as representative precision machining in the metal mold, electronic, and nuclear power industries.
[8] However, the conventional CNC electric discharge machine is inconvenient in that, after a drawing has been prepared on a Computer- Aided Design (CAD) system, the shape of a workpiece, a machining point, and the movement path of an electrode must be input using an NC machining programming device, converted into detailed NC machining data, and then used in the CNC electric discharge machine.
[9] Furthermore, only a machining point and the movement path of an electrode are displayed on the display unit, so that the shape of a workpiece already machined, and the shape of the workpiece to be realized after subsequent machining is completed, cannot be sufficiently observed, with the result that the defect rate of completed products increases due to errors in setting the workpiece. Disclosure of Invention Technical Problem
[10] Accordingly, the present invention has been made keeping in mind the above problems occurring in the prior art, and an object of the present invention is to provide a CNC small hole electric discharge machine capable of monitoring overall machining states using input CAD data, which can perform machining using only the CAD data input to the CNC small hole electric discharge machine, and which can display the overall machined state of a workpiece on a display unit. Technical Solution
[11] In order to accomplish the above objects, the present invention provides a CNC small hole electric discharge machine capable of monitoring overall machining states using input CAD data, the CNC small hole electric discharge machine including a data input unit for inputting machining criteria, such as an electrode type, a machining voltage, the shape of a workpiece, a machining point and the movement path of an electrode, a data storage unit for storing NC machining data into which machining criteria are systematically classified, an operation control unit for activating the machining criteria from the data storage unit, an electric discharge machining unit for performing machining according to the machining criteria, and a display unit for displaying the machining criteria and machining states, wherein:
[12] the data storage unit comprises a data conversion unit for converting the CAD data, such as the shape of the workpiece, which is input through the data input unit, into the NC machining data; and [13] the display unit displays the shape of the workpiece, the machining point, and the movement path of the electrode. [14] The data conversion unit includes a Computer- Aided Manufacturing (CAM) system for analyzing the input CAD data, extracting a machining sequence or a machining path with reference to the machining criteria stored in the data storage unit, and generating NC machining data. [15] The shape of the workpiece displayed on the display unit includes a shape before machining, a shape during machining, and a shape after machining. The shape before machining, the shape during machining, and the shape after machining of the workpiece displayed on the display unit are indicated in different colors.
Advantageous Effects [16] The above-described CNC small hole electric discharge machine capable of monitoring the overall machining states using input CAD data, facilitates the data input by using the CAD data and allows the overall machining process to be monitored, so that the location of a workpiece can be reliably set, and the defect rate of completed products can be remarkably reduced.
Brief Description of the Drawings [17] FlG. 1 is a perspective view showing a CNC small hole electric discharge machine capable of monitoring the overall machining states using input CAD data according to the present invention; [18] FlG. 2 is a block diagram showing the construction of the CNC small hole electric discharge machine according to the present invention; [19] FlG. 3 is a flowchart illustrating a machining process using the CNC small hole electric discharge machine according to the present invention; and [20] FlG. 4 is a diagram showing display screens for respective machining steps of the
CNC small hole electric discharge machine according to the present invention. [21] description of reference characters of principal elements>
[22] 1 : X, Y, Z-axis slide rest
[23] 2: tool electrode (drill member)
[24] 3: work table
[25] 4: input unit (keyboard and mouse)
[26] 5: display unit (monitor) J: jig
[27] W: workpiece 10: data input unit
[28] 20: data storage unit 21 : data conversion unit
[29] 30: operation control unit
[30] 40: electric discharge machining unit [31] 50: display unit P1,P2,P3: machining point
[32] L: the movement path of an electrode
Best Mode for Carrying Out the Invention
[33] A preferred embodiment of the present invention is described in detail with reference to the accompanying drawings below.
[34] FlG. 1 is a perspective view showing a CNC small hole electric discharge machine capable of monitoring the overall machining states using input CAD data according to the present invention, FlG. 2 is a block diagram showing the construction of the CNC small hole electric discharge machine according to the present invention, FlG. 3 is a flowchart illustrating a machining process using the CNC small hole electric discharge machine according to the present invention, and FlG. 4 is a diagram showing display screens for respective machining steps of the CNC small hole electric discharge machine according to the present invention.
[35] As shown in FlG. 1, the CNC small hole electric discharge machine capable of monitoring the overall machining states using input CAD data according to the present invention basically includes an X, Y, Z-axis slide rest 1, a tool electrode (drill member) 2, a power unit (not shown), a work table 3, an input unit (keyboard and mouse) 4, and a display unit (monitor) 5, like a general CNC electric discharge machine.
[36] Furthermore, in the drawing, reference characters J and W are respectively a jig and a workpiece, which is a target to be machined.
[37] In more detail, the CNC small hole electric discharge machine of the present invention, as shown in FlG. 2, includes a data input unit 10, a data storage unit 20, an operation control unit 30, an electric discharge machining unit 40, and a display unit 50.
[38] The data input unit 10 selectively inputs machining voltage, an electrode (drill member) type, an ON-time pulse width, an OFF-time pulse width, a machining process, a jump value, the shape of the workpiece, a machining point, the movement path of an electrode, and other special specifications according to the type or intended use of the workpiece W.
[39] In this case, the shape of the workpiece, the machining point, and the movement path of the electrode are input in the form of drawing data (CAD data) that was already designed using a CAD system.
[40] The machining voltage, the electrode (drill member) type, pulse widths, a machining process, a jump value, and other special specifications, which are machining criteria set through the data input unit 10, are systematically classified and are then stored in the data storage unit 20.
[41] The data storage unit 20 includes a data conversion unit 21 for converting the CAD data, such as the shape of the workpiece, that is input through the data input unit 10, into NC machining data.
[42] The data conversion unit 21 includes a CAM system for analyzing the input CAD data, extracting a machining sequence or a machining path with reference to the machining criteria stored in the data storage unit 20, and generating NC machining data.
[43] The operation control unit 30 subsequently activates the machining criteria, the shapes of the workpiece, and NC machining data, which have been classified and then stored in the data storage unit 20, and controls the electric discharge machining unit 40 and the display unit 50 to perform machining and display.
[44] The electric discharge machining unit 40 applies Direct Current (DC) power to the tool electrode (drill member) and the workpiece W according to the machining criteria stored in the data storage unit 20 under the control of the operation control unit 30, thus performing actual machining.
[45] The display unit 50 basically displays a selection menu with which the machining criteria can be input through the data input unit 10, and displays the overall details with respect to electric discharge machining, such as machining criteria, a machining path obtained when machining is actually performed, and machining states under the control of the operation control unit 30.
[46] The display unit 50 accumulatively displays the shape before machining of the workpiece, the point at which actual machining will be performed, the movement path of the electrode (drill member), the shape during machining of the workpiece, and the shape after machining of the workpiece, so that the overall machining process and overall machining states can be monitored at a glance.
[47] In this case, the display unit 50 may display only the shape of the workpiece, the machining point, or the movement path of the electrode (drill member) that is obtained at a specific machining step with reference to data about the accumulated overall machining process.
[48] A machining process using the CNC small hole electric discharge machine capable of monitoring overall machining states using input CAD data according to the present invention, is described. As shown in FlG. 3, the machining criteria, such as the machining voltage and the electrode (drill member) type, and the CAD data, such as the shape of the workpiece, are first input to the data input unit 10 at step SlOO.
[49] In this case, a user simply and personally inputs the CAD data into the data input unit 10 after preparing a drawing using the CAD system, without performing the task of conversion into detailed NC machining data by inputting the shape of the workpiece, the machining point, and the movement path of the electrode using an NC machining programming device. [50] Thereafter, the CAM system, which is provided in the data conversion unit 21 of the data storage unit 20, analyzes the input CAD data, such as the shape of the workpiece, extracts a machining sequence or a machining path etc., with reference to several machining criteria that have already been stored in the data storage unit 20, and generates the NC machining data at step 200.
[51] Thereafter, when the detailed NC machining data is generated, the display unit 50, as shown in FlG. 4, displays the shape before machining of the workpiece (including an already machined point Pl) under the control of the operation control unit 30 at step S300 (FlG. 4a).
[52] Accordingly, the shape of the workpiece has been previously displayed on the display unit 50, so that the user can reliably set the location of the workpiece.
[53] After the shape of the workpiece is displayed on the display unit 50, the point P2 to be actually machined and the movement path L of the electrode are displayed at step S400 (FlG. 4b).
[54] In this case, it is preferred that the point P2 to be actually machined (the point not yet machined) and the movement path L of the electrode (the path not yet moved) are indicated by a dotted line or in different colors, so that they are differentiated from the shape of the workpiece or the already machined point Pl.
[55] Thereafter, the electric discharge machining unit 40 moves the tool electrode (drill member) according to the movement path L of the electrode, which is displayed on the display unit 50, to the actual machining point P2 and then performs electric discharge machining at step 500 (FlG. 4c).
[56] The display unit 50 indicates point P2 to be actually machined using a color different from that of the workpiece or flashes the actual machining point P2 while the electric discharge machining is being performed, thus allowing whether the machining is performed to be clearly recognized at step S600.
[57] Thereafter, when the small hole electric discharge machining at the machining point
P2 is completed, the display unit 50 displays the shape before machining of the workpiece and the shape after machining of the workpiece together at step S700.
[58] In this case, it is preferred that the shapes before and after machining of the workpiece displayed on the display unit 50 be indicated in different colors to be differentiated from each other.
[59] Small hole electric discharge machining at a point P3 to be subsequently machined is also performed through the same procedure as that of the above-described process (FIG. 4d).
[60] Accordingly, the display unit 50 displays the shape before machining of the workpiece and the shape after machining of the workpiece together with the shape during machining of the workpiece, so that the machined states for respective steps can be visually monitored with ease, therefore the defect rate of products can be reduced. [61] Although only the specific illustrated embodiment of the present invention has been described in detail, it will be apparent to those skilled in the art that various changes or modifications are possible within the spirit and scope of the present invention and that such changes and modifications fall within the scope of the accompanying claims.

Claims

Claims
[1] A Computer Numerical Control (CNC) small hole electric discharge machine capable of monitoring overall machining states using input Computer- Aided Design (CAD) data, the CNC small hole electric discharge machine including a data input unit for inputting machining criteria, such as an electrode type, a machining voltage, a shape of a workpiece, a machining point and a movement path of an electrode, a data storage unit for storing Numerical Control (NC) machining data into which machining criteria are systematically classified, an operation control unit for activating the machining criteria from the data storage unit, an electric discharge machining unit for performing machining according to the machining criteria, and a display unit for displaying the machining criteria and machining states, wherein: the data storage unit comprises a data conversion unit for converting the CAD data, such as the shape of the workpiece, which is input through the data input unit, into the NC machining data; and the display unit displays the shape of the workpiece, the machining point, and the movement path of the electrode.
[2] The CNC small hole electric discharge machine according to claim 1, wherein the data conversion unit comprises a Computer- Aided Manufacturing (CAM) system for analyzing the input CAD data, extracting a machining sequence or a machining path with reference to the machining criteria stored in the data storage unit, and generating NC machining data.
[3] The CNC small hole electric discharge machine according to claim 1 or 2, wherein the shape of the workpiece displayed on the display unit includes a shape before machining, a shape during machining, and a shape after machining.
[4] The CNC small hole electric discharge machine according to claim 3, wherein the shape before machining, the shape during machining, and the shape after machining of the workpiece displayed on the display unit are indicated in different colors respectively.
PCT/KR2005/004638 2005-01-28 2005-12-29 Cnc small hole electric discharge machine WO2006080777A1 (en)

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KR1020050007927A KR100738344B1 (en) 2005-01-28 2005-01-28 Cnc small hole electric discharge machine which can monitor the whole state of processing by inputting cad data

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