WO2016016976A1 - 放電加工方法及び放電加工機 - Google Patents
放電加工方法及び放電加工機 Download PDFInfo
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- WO2016016976A1 WO2016016976A1 PCT/JP2014/070124 JP2014070124W WO2016016976A1 WO 2016016976 A1 WO2016016976 A1 WO 2016016976A1 JP 2014070124 W JP2014070124 W JP 2014070124W WO 2016016976 A1 WO2016016976 A1 WO 2016016976A1
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- discharge machining
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23H—WORKING OF METAL BY THE ACTION OF A HIGH CONCENTRATION OF ELECTRIC CURRENT ON A WORKPIECE USING AN ELECTRODE WHICH TAKES THE PLACE OF A TOOL; SUCH WORKING COMBINED WITH OTHER FORMS OF WORKING OF METAL
- B23H7/00—Processes or apparatus applicable to both electrical discharge machining and electrochemical machining
- B23H7/22—Electrodes specially adapted therefor or their manufacture
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23H—WORKING OF METAL BY THE ACTION OF A HIGH CONCENTRATION OF ELECTRIC CURRENT ON A WORKPIECE USING AN ELECTRODE WHICH TAKES THE PLACE OF A TOOL; SUCH WORKING COMBINED WITH OTHER FORMS OF WORKING OF METAL
- B23H1/00—Electrical discharge machining, i.e. removing metal with a series of rapidly recurring electrical discharges between an electrode and a workpiece in the presence of a fluid dielectric
- B23H1/04—Electrodes specially adapted therefor or their manufacture
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23H—WORKING OF METAL BY THE ACTION OF A HIGH CONCENTRATION OF ELECTRIC CURRENT ON A WORKPIECE USING AN ELECTRODE WHICH TAKES THE PLACE OF A TOOL; SUCH WORKING COMBINED WITH OTHER FORMS OF WORKING OF METAL
- B23H7/00—Processes or apparatus applicable to both electrical discharge machining and electrochemical machining
- B23H7/02—Wire-cutting
- B23H7/08—Wire electrodes
- B23H7/10—Supporting, winding or electrical connection of wire-electrode
- B23H7/105—Wire guides
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23H—WORKING OF METAL BY THE ACTION OF A HIGH CONCENTRATION OF ELECTRIC CURRENT ON A WORKPIECE USING AN ELECTRODE WHICH TAKES THE PLACE OF A TOOL; SUCH WORKING COMBINED WITH OTHER FORMS OF WORKING OF METAL
- B23H7/00—Processes or apparatus applicable to both electrical discharge machining and electrochemical machining
- B23H7/14—Electric circuits specially adapted therefor, e.g. power supply
- B23H7/20—Electric circuits specially adapted therefor, e.g. power supply for programme-control, e.g. adaptive
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23H—WORKING OF METAL BY THE ACTION OF A HIGH CONCENTRATION OF ELECTRIC CURRENT ON A WORKPIECE USING AN ELECTRODE WHICH TAKES THE PLACE OF A TOOL; SUCH WORKING COMBINED WITH OTHER FORMS OF WORKING OF METAL
- B23H2500/00—Holding and positioning of tool electrodes
- B23H2500/20—Methods or devices for detecting wire or workpiece position
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23H—WORKING OF METAL BY THE ACTION OF A HIGH CONCENTRATION OF ELECTRIC CURRENT ON A WORKPIECE USING AN ELECTRODE WHICH TAKES THE PLACE OF A TOOL; SUCH WORKING COMBINED WITH OTHER FORMS OF WORKING OF METAL
- B23H9/00—Machining specially adapted for treating particular metal objects or for obtaining special effects or results on metal objects
- B23H9/006—Cavity sinking
Definitions
- the present invention relates to an electric discharge machining method and an electric discharge machine capable of reducing an electrode completion waiting time when a core pin is manufactured.
- the connector for connecting electronic devices is formed by resin injection molding (see Patent Document 1).
- a die-sinking electric discharge machine is used for processing a core pin for providing a hole in a resin molded product.
- the electrode used in the die-sinking electric discharge machine is generally made by cutting, grinding, or wire electric discharge machining.
- the present invention has been made in view of the above, and an object thereof is to reduce an electrode completion waiting time when a core pin is manufactured.
- the present invention provides an electric discharge machining for machining a core pin for a resin mold using an electric discharge machine equipped with a secondary electrode for forming a round bar-shaped machining electrode.
- the electric discharge machining method according to the present invention has an effect of reducing the electrode completion waiting time when the core pin is manufactured.
- molding for creation electric discharge machining of a processing electrode Perspective view showing an example of generative electrical discharge machining
- molding for die-sinking electric discharge machining of a processing electrode Perspective view showing an example of die-sinking electrical discharge machining
- a perspective view showing an example of a workpiece after machining is completed
- molding a process electrode for die-sinking discharge in Embodiment 1 A perspective view showing an example of a machining electrode having a plurality of transfer shapes
- FIG. Side view showing an example of a region occupied by a machining electrode when the machining electrode formed for die-cutting electric discharge machining is rotated by a C-axis motor
- the side view which shows another example of the area
- FIG. 1 is a configuration diagram of an electric discharge machine according to Embodiment 1 of the present invention.
- the electric discharge machine 100 includes a control unit 101, a machining power source 102, an X-axis servo amplifier 103, a Y-axis servo amplifier 104, a Z-axis servo amplifier 105, a C-axis amplifier 106, an X-axis servo motor 107, a Y-axis servo motor 108, Z It has an axis servo motor 109, a machining head 120, and a work table 112.
- the machining head 120 includes a C-axis motor 110 and an electrode holder 111.
- the work table 112 is a table on which a work 130 as a workpiece is placed, and the X axis and the Y axis of the electric discharge machine 100 are parallel to the placement surface 112a on which the work 130 is placed.
- the Z axis of the electric discharge machine 100 extends in a direction perpendicular to the mounting surface 112a of the work table 112.
- the C axis of the electric discharge machine 100 extends in a direction parallel to the Z axis. That is, the X direction is the left-right direction when the electric discharge machine 100 is viewed from the front.
- the Y direction is the front-rear direction when the electric discharge machine 100 is viewed from the front.
- the Z direction is a vertical direction when the electric discharge machine 100 is viewed from the front. Note that the front-rear direction when the electric discharge machine 100 is viewed from the front may be the X direction, and the left-right direction may be the Y direction.
- the control unit 101 executes a numerical control program input from the computer-aided design and manufacturing apparatus 200, and controls the operation of each unit of the electric discharge machine 100.
- the X-axis servo amplifier 103 outputs a movement amount in the X direction to the X-axis servo motor 107 based on a position command from the control unit 101.
- the Y-axis servo amplifier 104 outputs the amount of movement in the Y direction to the Y-axis servo motor 108 based on the position command from the control unit 101.
- the Z-axis servo amplifier 105 outputs a movement amount in the Z direction to the Z-axis servo motor 109 based on a position command from the control unit 101.
- the X-axis servo motor 107 moves based on the movement amount input from the X-axis servo amplifier 103 to move the machining head 120 in the X direction.
- the Y-axis servo motor 108 moves based on the amount of movement input from the Y-axis servo amplifier 104 to move the machining head 120 in the Y direction.
- the Z-axis servo motor 109 moves based on the movement amount input from the Z-axis servo amplifier 105 to move the machining head 120 in the Z direction.
- the C-axis amplifier 106 outputs a rotation angle to the C-axis motor 110 that rotates the electrode holder 111.
- the C-axis motor 110 rotates the electrode holder 111 based on the rotation angle input from the C-axis amplifier 106.
- the electrode holder 111 holds a machining electrode 140 for electric discharge machining or a reference electrode 141 for positioning the workpiece 130.
- the processing electrode 140 has a round bar shape, but can be formed into another shape using the secondary electrode 131 as will be described later.
- a specific example of the material of the processing electrode 140 can be copper.
- Another specific example of the material of the processing electrode 140 may include a copper-tungsten alloy.
- the processing electrode 140 is held by the electrode holder 111 so that the central axis is located on the rotation axis of the C axis. When the electrode holder 111 is rotated by the C-axis motor 110, the machining electrode 140 or the reference electrode 141 held by the electrode holder 111 is also rotated together with the electrode holder 111.
- the C-axis extends in a direction parallel to the Z-axis, when the electrode holder 111 is rotated by the C-axis motor 110, the machining electrode 140 or the reference electrode 141 held by the electrode holder 111 is orthogonal to the XY plane.
- the direction of rotation is the rotation axis.
- the work table 112 is provided with a secondary electrode 131 used for forming the work 130 and the machining electrode 140.
- a specific example of the material of the secondary electrode 131 is a copper-tungsten alloy.
- the work table 112 includes a reference sphere 112b for aligning the machining electrode 140.
- the machining power supply 102 applies a pulse voltage for electric discharge machining between the electrode holder 111 and the work table 112 based on the machining conditions input from the control unit 101. Depending on the voltage applied by the machining power supply 101, the electric discharge machining of the workpiece 130 by the machining electrode 140 or the electric discharge machining of the machining electrode 140 by the secondary electrode 131 is performed.
- the computer-aided design and manufacturing apparatus 200 creates a numerical control program that is executed when the electric discharge machine 100 processes a core pin for a resin mold.
- the computer-aided design and manufacturing apparatus 200 controls the machine tool 300 to execute an operation for processing the secondary electrode 131.
- the machine tool 300 is a general machine tool, and examples thereof include a cutting device, a grinding device, and a wire electric discharge machine, but may be a different type of machine tool.
- FIG. 2 is a flowchart showing a flow of pre-processing operations for core pin machining by a computer-aided design and manufacturing apparatus.
- the computer-aided design and manufacturing apparatus 200 analyzes a process of forming the work 130 into a core pin for a resin mold, and analyzes the shape data of the work 130 after the creation electric discharge machining, The shape data of the workpiece 130 is created.
- work 130 after generating electric discharge machining is a rough shape of a core pin
- work 130 after die-sinking electric discharge machining is the shape of the completed core pin.
- the computer-aided design and manufacturing apparatus 200 designs the secondary electrode 131 used for forming the machining electrode 140 based on the shape data of the work 130 after the die-sinking electric discharge machining.
- the secondary electrode 131 is designed to include all the shape elements used when forming the machining electrode 140 for die-sinking electric discharge machining and a flat surface used when shaping the machining electrode 140 for generating electric discharge machining. Is done.
- the “shape element” is a surface for forming on the machining electrode 140 a shape to be transferred to the workpiece 130 by die-sinking electric discharge machining.
- the processing electrode 140 can be formed not only with a transfer shape of the shape element included in the secondary electrode 131 but also with a shape obtained by combining a plurality of shape elements. For example, if a shape formed by two surfaces is transferred from the machining electrode 140 to the workpiece 130 by die-sinking electric discharge machining, the machining electrode 140 is formed by using two shape elements of the secondary electrode 131. Molded for carved electrical discharge machining. After the design of the secondary electrode 131 is completed, the computer-aided design and manufacturing apparatus 200 controls the machine tool 300 to create the secondary electrode 131 in step S103.
- FIG. 3 is a side view showing an example of the secondary electrode
- FIGS. 4 and 5 are cross-sectional views showing examples of the secondary electrode.
- 4 shows a cross section taken along the line IV-IV in FIG. 3
- FIG. 5 shows a cross section taken along the line VV in FIG.
- the secondary electrode 131 includes four shape elements 131a, 131b, 131c, and 131d and a flat surface 131e.
- FIG. 6 is a flowchart showing a flow of operations of the electric discharge machine according to the first embodiment.
- step S ⁇ b> 201 the worker installs the workpiece 130 and the secondary electrode 131 on the workpiece table 112 shown in FIG. 1, and attaches the reference electrode 141 to the electrode holder 111.
- step S202 processing of the core pin is started.
- the control unit 101 positions the workpiece 130 in step S203. As an example, the control unit 101 brings the reference electrode 141 attached to the electrode holder 111 shown in FIG.
- the posture of the work 130 is the inclination of the work 130 in the XY plane, that is, the deviation between the direction of the XY axis of the electric discharge machine 100 and the vertical and horizontal directions of the work 130.
- the control unit 101 determines that the direction specified by the control program input from the computer-aided design and manufacturing apparatus 200 is an angle corresponding to the deviation between the vertical and horizontal directions of the workpiece 130 and the XY axis direction of the electric discharge machine 100.
- step S204 the control unit 101 replaces the electrode held by the electrode holder 111 from the reference electrode 141 to the processing electrode 140, and brings the processing electrode 140 into contact with the reference sphere 112b from the + Z direction, thereby processing electrode 140. Position in the Z direction.
- the control unit 101 determines in step S205 whether or not creation electrical discharge machining is included in the machining created by the core pin.
- the control unit 101 shapes the machining electrode 140 for generating electric discharge machining in step S206.
- the control unit 101 outputs a position command indicating the forming position to the X-axis servo amplifier 103, the Y-axis servo amplifier 104, and the Z-axis servo amplifier 105, and also outputs the C-axis.
- the rotation angle is output to the amplifier 106.
- the control unit 101 instructs a voltage to be applied between the work table 112 and the machining head 120.
- FIG. 7 is a perspective view showing an example of forming a machining electrode for generating electric discharge machining.
- the processing electrode 140 held by the electrode holder 111 rotates with a direction orthogonal to the XY plane as a rotation axis.
- the C-axis motor 110 is driven to rotate the machining electrode 140 around the C-axis, By moving the processing electrode 140 so as to trace the flat surface 131e of the next electrode 131, the lower end of the processing electrode 140 is processed flat.
- the control unit 101 After processing the lower end of the machining electrode 140 to be flat, the control unit 101 performs generating electric discharge machining in step S207.
- the control unit 101 When performing generating electric discharge machining, the control unit 101 outputs a position command indicating a machining position and a machining depth to the X-axis servo amplifier 103, the Y-axis servo amplifier 104, and the Z-axis servo amplifier 105, and a C-axis amplifier 106. The rotation angle is output to.
- the control unit 101 instructs a voltage to be applied between the work table 112 and the machining head 120.
- FIG. 8 is a perspective view showing an example of generating electric discharge machining. In the generated electric discharge machining, as shown in FIG. 8, the rough shape of the core pin is cut out from the workpiece 130 by moving the machining electrode 140 while a voltage is applied to the workpiece table 112 and the machining head 120.
- the control unit 101 forms a machining electrode for die-sinking electric discharge machining in step S208.
- the control unit 101 outputs a position command indicating the forming position to the X-axis servo amplifier 103, the Y-axis servo amplifier 104, and the Z-axis servo amplifier 105, and C The rotation angle is output to the axis amplifier 106.
- the control unit 101 instructs a voltage to be applied between the work table 112 and the machining head 120.
- FIG. 9 is a perspective view showing an example of forming the machining electrode for die-sinking electric discharge machining.
- the C-axis motor 110 is stopped while the voltage is applied to the work table 112 and the machining head 210, and the shape element 131a of the secondary electrode 131 is traced.
- the transferred shape of the shape element 131 a of the secondary electrode 131 is formed on the processed electrode 140 by moving the processed electrode 140.
- a plurality of shape elements 131a, 131b, 131c, and 131d are combined to form a shape to be transferred to the work 130 on the machining electrode 140.
- the side surface of the processing electrode 140 can be processed into a flat surface by moving the processing electrode 140 along the side surface of the secondary electrode 131.
- the processing electrode 140 can be formed into a prismatic shape.
- step S209 the control unit 101 positions the machining electrode 140 in the Z direction by bringing the machining electrode 140 formed for die-sinking electric discharge machining into contact with the reference sphere 112b shown in FIG. 1 from the + Z direction.
- the control unit 101 moves the machining head 120 so that the machining electrode 140 is disposed at the machining position in step S210, and then the workpiece table 112, the machining head 120, and the like. With the voltage applied to the workpiece 130, the machining electrode 140 is brought closer to the workpiece 130 from the + Z direction, so that the workpiece 130 is subjected to die-sinking electric discharge machining.
- the control unit 101 When performing the die-sinking electric discharge machining, the control unit 101 outputs a position command indicating a forming position and a machining depth to the X-axis servo amplifier 103, the Y-axis servo amplifier 104, and the Z-axis servo amplifier 105, and a C-axis amplifier. The rotation angle is output to 106. In addition, the control unit 101 instructs a voltage to be applied between the work table 112 and the machining head 120.
- FIG. 10 is a perspective view showing an example of die-sinking electric discharge machining.
- the control unit 101 determines in step S211 whether or not the die-sinking electric discharge machining is completed. In step S211, the control unit 101 determines that the die-sinking electric discharge machining has been completed when the control unit 101 executes the numerical control program input from the computer-aided design and manufacturing apparatus 200 to the end.
- step S211 / No the process proceeds to step S208, and the control unit 101 repeats steps S208 to S211 until the die-sinking electric discharge machining is completed.
- the control unit 101 ends the processing (step S211 / Yes).
- the control unit 101 repeats steps S208 to S211 to change the shape electrode transferred from the secondary electrode to the machining electrode in the process of forming the machining electrode for die machining electric discharge machining.
- the step of forming for the purpose and the step of performing die-sinking electric discharge machining are performed a plurality of times.
- step S209 when continuously performing the die-sinking electric discharge machining for transferring the same shape from the machining electrode 140 to the workpiece 130, the process proceeds to step S209 after step S211 / No, and the machining electrode 140 is used for die-sinking electric discharge machining. It is also possible to omit the forming process.
- FIG. 11 is a perspective view showing an example of a workpiece after machining is completed.
- the workpiece 130 is machined into the shape of the core pin by the control unit 101 transferring the shape of the machining electrode 140 to the workpiece 130 in which the outer shape of the core pin is cut out by generating electric discharge machining. .
- an electric discharge machine in which a machining electrode for generating electric discharge machining and a machining electrode for die-sinking electric discharge machining are different will be described as a comparative example.
- the electric discharge machine of the comparative example is the same as the electric discharge machine 100 of the first embodiment with respect to generating electric discharge machining with a round bar-shaped machining electrode.
- FIG. 12 is a schematic view of an electrode for die-sinking electric discharge machining used by an electric discharge machine according to a comparative example.
- the electric discharge machining electrode 40 used by the electric discharge machine of the comparative example has a structure in which a plurality of electrode portions 41a, 41b, and 41c protrude from the base portion 42, and the electrode portions 41a, 41b, and 41c are formed in the same shape. ing. Further, the holding portion 43 protrudes from the base portion 42 in a direction opposite to the direction in which the electrode portions 41 a, 41 b, 41 c protrude from the base portion 42. By holding the holding portion 43, the die-sinking electric discharge machining electrode is attached to an electrode holder included in the electric discharge machine of the comparative example.
- the reason why the die-cut electric discharge machining electrode 40 is provided with the electrode portions 41a, 41b, 41c having the same shape is that it is not necessary to replace the die-cut electric discharge machining electrode 40 when transferring the same shape to a plurality of locations on the workpiece. Because. That is, when the electrode portion 41a is consumed, the die-cut electric discharge machining can be performed using another electrode portion 41b, 41c. Therefore, until the electrode portions 41a, 41b, 41c are all consumed, the electrode for die-cut electric discharge machining is used. Replacement of 40 is not necessary.
- the machining electrode 40 having a structure in which a plurality of electrode portions 41a, 41b, and 41c protrude from the base portion 42 is removed by machining the portions between the electrode portions 41a, 41b, and 41c when forming the die-cut electric discharge machining electrode 40. Will be. In FIG. 12, a portion to be removed when forming the electrode for electric discharge machining EDM 40 is surrounded by a broken line.
- the plurality of electrode portions 41 a, 41 b, 41 c include those formed at positions shifted from the holding portion 43. Therefore, when the electrode portions 41a, 41b, and 41c to be used are changed, prior to starting the die-cut electric discharge machining, not only the Z direction but also the X-direction and Y-direction of the die electric discharge machining electrode 40 are used. Positioning work is required.
- the electrode 40 for die-sinking electric discharge machining has only the electrode portions 41a, 41b, and 41c having the same shape, when transferring another shape to the workpiece by die-sinking electric discharge machining, the electrode for die engraving electric discharge machining It is necessary to replace 40 with another electrode for electric discharge machining.
- the electric discharge machine 100 uses the same machining electrode 140 for both the generation electric discharge machining and the die-sinking electric discharge machining, when the electric discharge machining is shifted from the electric discharge machining to the electric discharge electric discharge machining. Unlike the comparative example, the machining electrode 140 does not need to be replaced. Accordingly, the time required from the start of processing to the end of processing can be reduced as compared with a comparative example using different processing electrodes for generating electric discharge machining and die-sinking electric discharge machining.
- the machining electrode 140 has a round bar shape and the central axis of the machining electrode 140 is positioned on the rotation axis of the C axis, it is not necessary to align the machining electrode 140 in the X direction and the Y direction. Even after the machining electrode 140 is formed for die-sinking electric discharge machining, the center of the round bar, which is the original shape of the machining electrode 140, is located on the rotation axis of the C axis. No alignment is required. Therefore, compared with the case where alignment of the machining electrode 140 in the X direction and the Y direction is required, the time required from the machining start to the machining end can be reduced.
- FIG. 13 is a schematic diagram showing an example of a portion that is removed when the machining electrode is formed for die-sinking discharge in the first embodiment.
- a portion to be removed when the machining electrode 140 is formed for die-sinking electric discharge machining is surrounded by a broken line.
- a portion that is removed as compared with the machining electrode 40 having a structure in which the plurality of electrode portions 41a, 41b, 41c protrude from the base portion 42 shown in FIG. Becomes smaller. Thereby, the electrode material discarded without being used for electrical discharge machining can be reduced, and cost reduction can be achieved.
- the machining electrode 140 can be formed into a plurality of different shapes by using the secondary electrode 131 having a plurality of shape elements, the die-cut electric discharge machining for transferring the different shapes to the workpiece 130 is performed by one machining electrode 140. Can be done. Therefore, even when the die-sinking electric discharge machining for transferring another shape to the workpiece 130 after performing the die-sinking electric discharge machining for transferring a certain shape from the machining electrode 140 to the workpiece 130, it is only necessary to re-shape the machining electrode 140. Since it is not necessary to replace the machining electrode 140, the time required from the machining start to the machining end can be reduced as compared with the case where the electrode exchange is necessary.
- the processing electrode 140 can have a plurality of transfer shapes at the same time.
- FIG. 14 is a perspective view showing an example of a processing electrode having a plurality of transfer shapes.
- the machining electrode when the machining electrode is formed for generating electric discharge machining, the lower end portion is processed flat.
- the diameter of the machining electrode may be reduced by forming for generating electric discharge machining.
- the electric discharge machine 100 performs a creation electric discharge machining that cuts a rough shape of the core pin from the work 130 with the machining electrode 140, and transfers the shape element of the secondary electrode 131 to the machining electrode 140.
- the machining electrode 140 is formed for die-sinking electric discharge machining, and the machining electrode 140 shaped for die-sinking electric discharge machining is used to perform die-sinking electric discharge machining on the workpiece 130 cut out to the approximate shape of the core pin.
- FIG. 15 is a flowchart showing a flow of operations of the electric discharge machine according to the second embodiment.
- the operation from step S301 to S310 is the same as the operation from step S201 to S210 in the first embodiment.
- the control unit 101 determines in step S311 whether or not machining is completed. When the machining is not completed (step S311 / No), the control unit 101 determines in step S312 whether the next machining is die-sinking electric discharge machining.
- step S312 / Yes If the next machining is die-sinking electric discharge machining (step S312 / Yes), the control unit 101 forms the machining electrode 140 for die-sinking electric discharge machining (step S308), and positions the machining electrode 140 in the Z direction. (Step S309) and die-sinking electric discharge machining is performed (step S310). If the next processing is generating electric discharge machining (step S312 / No), the control unit 101 forms the processing electrode 140 for generating electric discharge machining (step S306) and then performs generating electric discharge processing (step S307).
- the second embodiment even if it is necessary to perform generating electric discharge machining after performing die-sinking electric discharge machining, it is only necessary to re-form the machining electrode 140, and replacement of the machining electrode 140 is not necessary. Compared to the case where replacement is necessary, the time required from the start of processing to the end of processing can be reduced.
- FIG. 16 is a side view showing an example of a region occupied by a machining electrode when the machining electrode formed for die-sinking electric discharge machining is rotated by a C-axis motor. Since the region 150 occupied by the machining electrode 140 rotated around the C-axis has a cylindrical shape, the EDM is performed by driving the C-axis motor 110 and rotating the machining electrode 140 to generate EDM. The forming for can be omitted.
- FIG. 17 is a side view showing another example of a region occupied by a machining electrode when the machining electrode formed for die-sinking electric discharge machining is rotated by a C-axis motor. Since the region 160 occupied by the machining electrode 140 rotated around the C-axis is not cylindrical, it is necessary to form the machining electrode 140 for generating electric discharge machining in order to perform generating electric discharge machining after die-sinking electric discharge machining. There is.
- the machining start is started compared with the case where the electrode needs to be exchanged. The time required to complete the processing can be reduced.
- Electrode for EDM 41a, 41b, 41c Electrode, 42 Base, 43 Holding Unit, 100 Electrical Discharge Machine, 101 Control Unit, 102 Machining Power Supply, 103 X-axis Servo Amplifier, 104 Y-axis Servo Amplifier, 105 Z Axis servo amplifier, 106 C axis amplifier, 107 X axis servo motor, 108 Y axis servo motor, 109 Z axis servo motor, 110 C axis motor, 111 electrode holder, 112 work table, 112a mounting surface, 112b reference ball, 120 Machining head, 130 workpiece, 131 secondary electrode, 131a, 131b, 131c, 131d shape element, 131e flat surface, 140 machining electrode, 141 reference electrode, 150, 160, region occupied by machining electrode rotated around C axis, 200 Computer-aided design and manufacturing equipment 300 machine tools.
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Abstract
Description
図1は、本発明の実施の形態1に係る放電加工機の構成図である。放電加工機100は、制御部101、加工電源102、X軸サーボアンプ103、Y軸サーボアンプ104、Z軸サーボアンプ105、C軸アンプ106、X軸サーボモータ107、Y軸サーボモータ108、Z軸サーボモータ109、加工ヘッド120及びワーク台112を有する。加工ヘッド120は、C軸モータ110及び電極ホルダ111を備える。
本発明の実施の形態2に係る放電加工機の構成は実施の形態1と同様である。図15は、実施の形態2に係る放電加工機の動作の流れを示すフローチャートである。ステップS301からS310の動作は実施の形態1のステップS201からS210の動作と同様である。型彫放電加工により加工電極140の形状をワーク130へ転写したら、制御部101は、ステップS311において、加工が完了したか否かを判断する。加工完了でない場合は(ステップS311/No)、制御部101は、ステップS312において、次の加工が型彫放電加工であるかを判断する。次の加工が型彫放電加工であれば(ステップS312/Yes)、制御部101は、加工電極140を型彫放電加工用に成形し(ステップS308)、加工電極140のZ方向の位置決めを行って(ステップS309)、型彫放電加工を行う(ステップS310)。次の加工が創成放電加工であれば(ステップS312/No)、制御部101は、加工電極140を創成放電加工用に成形したのち(ステップS306)、創成放電加工を行う(ステップS307)。
Claims (6)
- 丸棒状の加工電極の成形用に二次電極を備えた放電加工機を用いて樹脂金型用のコアピンを加工する放電加工方法であって、
前記加工電極でワークから前記コアピンの概略形状を削り出す創成放電加工を実行する工程と、
前記加工電極に、前記二次電極の形状要素を転写して、前記加工電極を型彫放電加工用に成形する工程と、
型彫放電加工用に成形した加工電極を用いて、前記コアピンの概略形状に削り出されたワークに型彫放電加工を施す工程と
を有することを特徴とする放電加工方法。 - 前記二次電極は、複数の形状要素を備えており、
前記加工電極を前記型彫放電加工用に成形する工程において、前記二次電極から前記加工電極に転写する形状要素を変えながら、前記加工電極を型彫放電加工用に成形する工程と、前記型彫放電加工を実行する工程とを複数回繰り返すことを特徴とする請求項1に記載の放電加工方法。 - 前記型彫放電加工を実行する工程の後に、前記型彫放電加工用に成形された加工電極を丸棒状に成形する工程を実行し、
丸棒状に成形した加工電極を用いて、前記ワークに創成放電加工を施すことを特徴とする請求項1に記載の放電加工方法。 - 丸棒状の加工電極の成形用に二次電極を備えた放電加工機であって、
前記加工電極でワークからコアピンの概略形状を創成放電加工で削り出す動作と、前記加工電極に前記二次電極の形状要素を転写して型彫放電加工用に成形する動作と、前記型彫放電加工用に成形した加工電極を用いて前記コアピンの概略形状に削り出されたワークに型彫り放電加工を施す動作とを制御する制御部を有することを特徴とする放電加工機。 - 前記二次電極は、形状要素を複数備え、
前記制御部は、
前記加工電極を前記型彫放電加工用に成形する動作において前記二次電極から前記加工電極に転写する形状要素を変えながら、前記加工電極を型彫放電加工用に成形する動作と、前記型彫放電加工を実施する動作とを複数回繰り返し実行することを特徴とする請求項4に記載の放電加工機。 - 前記制御部は、前記加工電極を前記型彫放電加工用に成形した後で前記ワークに創成放電加工を施す際に、前記二次電極を用いて前記加工電極を丸棒状に成形することを特徴とする請求項4に記載の放電加工機。
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US15/319,405 US9849530B2 (en) | 2014-07-30 | 2014-07-30 | Electric discharge machining method and electric discharge machine |
PCT/JP2014/070124 WO2016016976A1 (ja) | 2014-07-30 | 2014-07-30 | 放電加工方法及び放電加工機 |
DE112014006780.6T DE112014006780B4 (de) | 2014-07-30 | 2014-07-30 | Funkenerodierbearbeitungsverfahren und Funkenerodiermaschine |
JP2015527699A JP5908176B1 (ja) | 2014-07-30 | 2014-07-30 | 放電加工方法及び放電加工機 |
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- 2014-07-30 CN CN201480080853.9A patent/CN106536107B/zh active Active
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CN106536107B (zh) | 2018-04-17 |
CN106536107A (zh) | 2017-03-22 |
US9849530B2 (en) | 2017-12-26 |
US20170151619A1 (en) | 2017-06-01 |
DE112014006780T5 (de) | 2017-03-16 |
JP5908176B1 (ja) | 2016-04-26 |
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DE112014006780B4 (de) | 2019-07-11 |
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